2x➖2✖️0.3=8怎么检验?
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解:解方程, 此方程的解为x = 43/10,【即x = 4.3】
2x - 2 × 0.3 = 8
2x - 2 × 3/10 = 8
2x - 3/5 = 8
2x = 8 + 3/5
2x = 40/5 + 3/5
2x = 43/5
x = 43/5 ÷ 2
x = 43/5 × 1/2
x = 43/10
∴x = 4.3
经检验,2 × 4.3 - 2 × 0.3 = 8符合题意
答:此方程的解为x = 43/10,【即x = 4.3】
2x - 2 × 0.3 = 8
2x - 2 × 3/10 = 8
2x - 3/5 = 8
2x = 8 + 3/5
2x = 40/5 + 3/5
2x = 43/5
x = 43/5 ÷ 2
x = 43/5 × 1/2
x = 43/10
∴x = 4.3
经检验,2 × 4.3 - 2 × 0.3 = 8符合题意
答:此方程的解为x = 43/10,【即x = 4.3】
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