2x+5=15.8验算?
1个回答
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解:解方程, 此方程的解为x = 27/5,【即x = 5.4】
2x + 5 = 15.8
2x = 15.8 - 5
2x = (15×10+8)/10 - 5
2x = 158/10 - 50/10
2x = 108/10
2x = 54/5
x = 54/5 ÷ 2
x = 54/5 × 1/2
x = 27/5
∴x = 5.4
经检验,2 × 5.4 + 5 = 15.8符合题意
答:此方程的解为x = 27/5,【即x = 5.4】
2x + 5 = 15.8
2x = 15.8 - 5
2x = (15×10+8)/10 - 5
2x = 158/10 - 50/10
2x = 108/10
2x = 54/5
x = 54/5 ÷ 2
x = 54/5 × 1/2
x = 27/5
∴x = 5.4
经检验,2 × 5.4 + 5 = 15.8符合题意
答:此方程的解为x = 27/5,【即x = 5.4】
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