x-(3/4-2/5)=2/5怎么验算?
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解:解方程, 此方程的解为x = 3/4,【即x = 0.75】
x -(3/4 - 2/5)= 2/5
x - 3/4 + 2/5 = 2/5
x - 3/4 = 2/5 - 2/5
x - 3/4 = 0
x = 0 + 3/4
x = 3/4
∴x = 0.75
经检验,0.75 - (3/4 - 2/5) = 2/5符合题意
答:此方程的解为x = 3/4,【即x = 0.75】
x -(3/4 - 2/5)= 2/5
x - 3/4 + 2/5 = 2/5
x - 3/4 = 2/5 - 2/5
x - 3/4 = 0
x = 0 + 3/4
x = 3/4
∴x = 0.75
经检验,0.75 - (3/4 - 2/5) = 2/5符合题意
答:此方程的解为x = 3/4,【即x = 0.75】
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