下列各题怎样简便就怎样计算(1)75-25÷715-17; (2)(50×49×48)÷(16×15×14);(3)4.06×1

2024-12-02 13:14:47
推荐回答(1个)
回答1:

(1)

7
5
-
2
5
÷
7
15
-
1
7

=
7
5
-
2
5
×
15
7
-
1
7

=
7
5
-
6
7
-
1
7

=
7
5
-(
6
7
+
1
7

=
7
5
-1
=
2
5


(2)(50×49×48)÷(16×15×14)
=(50÷15)×(49÷14)×(48÷16)
=
10
3
×
7
2
×3
=35

(3)4.06×125%+7.36÷
4
5
-0.142×12.5
=4.06×1.25+7.36×1.25-1.42×1.25
=(4.06+7.36-1.42)×1.25
=10×1.25
=12.5

(4)
1
2
+
1
5
+
1
8
+
1
11
+
1
20
+
1
40
+
1
110

=(
1
2
+
1
5
)+(
1
11
+
1
110