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7.2÷0.6十1.6x3.2

解方程 (x-1.6)×3=7.2 x-1.6=2.4 x=4 所以原方程的解为x=4.

3.7–2.1x=1.6 2.1x=3.7-1.6 2.1x=2.1 x=1

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