题目内容
解方程.
| 5x-7.8=20.2 | 3.5x+0.45=2.9 | x÷3.4=10.2. |
(1)5x-7.8=20.2,
5x-7.8+7.8=20.2+7.8,
5x=28,
5x÷5=28÷5,
x=5.6;
(2)3.5x+0.45=2.9,
3.5x+0.45-0.45=2.9-0.45,
3.5x=2.45,
3.5x÷3.5=2.45÷3.5,
x=0.7;
(3)x÷3.4=10.2,
x÷3.4×3.4=10.2×3.4,
x=34.68.
5x-7.8+7.8=20.2+7.8,
5x=28,
5x÷5=28÷5,
x=5.6;
(2)3.5x+0.45=2.9,
3.5x+0.45-0.45=2.9-0.45,
3.5x=2.45,
3.5x÷3.5=2.45÷3.5,
x=0.7;
(3)x÷3.4=10.2,
x÷3.4×3.4=10.2×3.4,
x=34.68.
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