题目内容
求未知数x
10%x-8=123:x=0.2:8
=3:413×(2+2x)=52.
10%x-8=123:x=0.2:8
| x |
| 28 |
(1)10%x-8=12,
10%x-8+8=12+8,
10%x÷10%=20÷10%,
x=200;
(2)3:x=0.2:8,
0.2x=3×8,
0.2x÷0.2=24÷0.2,
x=120;
(3)
=3:4,
4x=28×3,
4x÷4=84÷4,
x=21;
(4)13×(2+2x)=52,
13×(2+2x)÷13=52÷13,
2+2x=4,
2+2x-2=4-2,
2x÷2=2÷2,
x=1.
10%x-8+8=12+8,
10%x÷10%=20÷10%,
x=200;
(2)3:x=0.2:8,
0.2x=3×8,
0.2x÷0.2=24÷0.2,
x=120;
(3)
| x |
| 28 |
4x=28×3,
4x÷4=84÷4,
x=21;
(4)13×(2+2x)=52,
13×(2+2x)÷13=52÷13,
2+2x=4,
2+2x-2=4-2,
2x÷2=2÷2,
x=1.
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