x+0.5x=30
| 9 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1.8 |
| x |
| 7.2 |
| 0.8 |
1.5x=30,
1.5x÷1.5=30÷1.5,
x=20;
(2)
| 9 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 9 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 9 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 9 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 15 |
| 8 |
| 1 |
| 4 |
| 1 |
| 4 |
| 15 |
| 8 |
| 1 |
| 4 |
x=7
| 1 |
| 2 |
(3)
| 1.8 |
| x |
| 7.2 |
| 0.8 |
7.2x=1.8×0.8,
7.2x=1.44,
7.2x÷7.2=1.44÷7.2,
x=0.2.
编辑:chaxungu时间:2026-04-27 13:37:50分类:小学数学题库
| 9 |
| 4 |
| 1 |
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| 8 |
| 1.8 |
| x |
| 7.2 |
| 0.8 |
| 9 |
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| 1 |
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| 3 |
| 8 |
| 9 |
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| 9 |
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| 1 |
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| 9 |
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| 8 |
| 1 |
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| 1 |
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| 15 |
| 8 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1.8 |
| x |
| 7.2 |
| 0.8 |
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