四x减一点二等于七十四怎么验算?
3个回答
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解:解方程, 此方程的解为x = 94/5,【即x = 18.8】
4x - 1.2 = 74
4x - (1×10+2)/10 = 74
4x - 12/10 = 74
4x - 6/5 = 74
4x = 74 + 6/5
4x = 370/5 + 6/5
4x = 376/5
x = 376/5 ÷ 4
x = 376/5 × 1/4
x = 94/5
∴x = 18.8
经检验,4 × 18.8 - 1.2 = 74符合题意
答:此方程的解为x = 94/5,【即x = 18.8】
4x - 1.2 = 74
4x - (1×10+2)/10 = 74
4x - 12/10 = 74
4x - 6/5 = 74
4x = 74 + 6/5
4x = 370/5 + 6/5
4x = 376/5
x = 376/5 ÷ 4
x = 376/5 × 1/4
x = 94/5
∴x = 18.8
经检验,4 × 18.8 - 1.2 = 74符合题意
答:此方程的解为x = 94/5,【即x = 18.8】
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