帮我回答一道数学题 急需答案 急 急 急 急 急 急急急急急急急急急急急急急

一.1解：设她做对了x道，那么做错了（20-x）道，则
5x-2(20-x)=79
x =17
所以她做错了20-17=3.
2.解:设媛媛家到外婆家大约有x千米（x>3),则
10+1.8（x-3）=13.6 （10元是行驶的3千米）
x =5
所以大约有5千米.
3.解：设原来甲堆有x颗棋子,那么乙堆有2x颗棋子，则
x+9=2x-9
x=18
所以原来甲堆有18颗棋子.
4.这题没有数据，不好算。
5.解：设小名做对了x道题，那么做错了（20-x）道，则
5x-3(20-x)=60
x=15
所以小名做对了15道.
正确率：40÷（10+40）=80％
二.1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 300
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)= 120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 3000
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50= 600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200=2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 = 230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 = 10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 = 320
81.40×80 = 3200
82.400÷80 = 5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10= 360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30= 690
99.30×50= 1500
100.5×700=3500
相信我，一定对的！！！！！！

1. 假设全做对. 20*5=100(分) 100-79=21(分) 21/(5+2)=3(道)
2．10+1.8（X-3）=13.6 解得x=5. 答案5千米
3.18个棋子
设甲有X个棋子，乙就有2x个。
x+9=2x-9
4．？？
5．假设全做对．20*5-60=40(分) 错:40/(5+3)=5(道) 对:20-5=15(道)
6.40/(40+10)=80%
7.1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
呼～～～～终于做完了，选我为最佳答案哟！！

1.做错3题，对17题
2、10+1.8（X-3）=13.6 解得x=5. 答案5千米
3.18个棋子
设甲有X个棋子，乙就有2x个。
x+9=2x-9
4.电线杆的问题你没有说清，我无法解答。可以直接在线交谈
5、小名做对15题。

1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500

1.做错3题，对17题
2、10+1.8（X-3）=13.6 解得x=5. 答案5千米
3.18个棋子
设甲有X个棋子，乙就有2x个。
x+9=2x-9
4.电线杆的问题你没有说清，我无法解答。可以直接在线交谈
5、小名做对15题。

1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500

5加2等于7
20乘5等于100
依此类推
........

1.做错3题，对17题
2、10+1.8（X-3）=13.6 解得x=5. 答案5千米
3.18个棋子
设甲有X个棋子，乙就有2x个。
x+9=2x-9
4.电线杆的问题你没有说清，我无法解答。可以直接在线交谈
5、小名做对15题。

1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500