解方程. 5x-7.8=20.2
解方程.5x-7.8=20.23.5x+0.45=2.9x÷3.4=10.2....
解方程. 5x-7.8=20.2 3.5x+0.45=2.9 x÷3.4=10.2.
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沉默小辉Vj6
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(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. |
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