(1)x-25%x=7
1 2
0.75x=7.5
0.75x÷0.75=7.5÷0.75
x=10;
(2)
÷x=5 9
5 6
÷x×x=5 9
×x5 6
x=5 6
5 9
x×5 6
=6 5
×5 9
6 5
x=
;2 3
(3)x÷
=5 7
3 10
x÷
×5 7
=5 7
×3 10
5 7
x=
;3 14
(4)60%x=13.2
0.6x=13.2
0.6x÷0.6=13.2÷0.6
x=22;
(5)2+
x=125 8
2+
x-2=12-25 8
x=105 8
x×5 8
=10×8 5
8 5
x=16;
(6)
x+1 4
x=1 6
10 21
&nb