题目内容
解比例:
=
.
| 90-x |
| 14 |
| 90-2x |
| 10 |
| 90-x |
| 14 |
| 90-2x |
| 10 |
10×(90-x)=14×(90-2x),
900-10x=1260-28x,
900-10x+28x=1260-28x+28x,
18x+900=1260,
18x+900-900=1260-900,
18x÷18=360÷18,
x=20.
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题目内容
| 90-x |
| 14 |
| 90-2x |
| 10 |
| 90-x |
| 14 |
| 90-2x |
| 10 |