题目内容
解方程.
(1)x×(1-25%)=1.5
(2)8(x-2)=2(x+7)
(3)
x+8×0.5=16.
(1)x×(1-25%)=1.5
(2)8(x-2)=2(x+7)
(3)
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(1)x×(1-25%)=1.5,
75%x=1.5,
75%x÷75%=1.5÷75%,
x=2;
(2)8(x-2)=2(x+7),
8x-16+16=2x+14+16,
8x-2x=2x+30-2x,
6x=30,
6x÷6=30÷6,
x=5;
(3)
x+8×0.5=16,
x+4-4=16-4,
x=12,
x÷
=12÷
,
x=9.
75%x=1.5,
75%x÷75%=1.5÷75%,
x=2;
(2)8(x-2)=2(x+7),
8x-16+16=2x+14+16,
8x-2x=2x+30-2x,
6x=30,
6x÷6=30÷6,
x=5;
(3)
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| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
x=9.
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