6(2x-1.5)=15解方程并检验?
2个回答
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解:解方程,此方程的解为x = 2
6(2x-1.5)=15
12x - 6 × 1.5 = 15
12x - 6 × (1×10+5)/10 = 15
12x - 6 × 15/10 = 15
12x - 6 × 3/2 = 15
12x - 9 = 15
12x = 15 + 9
12x = 24
x = 24 ÷ 12
x = 24 × 1/12
x = 24/12
x = (12×2)/12
∴x = 2
经检验,6 × (2 × 2 - 1.5)= 15符合题意
答:此方程的解为x = 2
6(2x-1.5)=15
12x - 6 × 1.5 = 15
12x - 6 × (1×10+5)/10 = 15
12x - 6 × 15/10 = 15
12x - 6 × 3/2 = 15
12x - 9 = 15
12x = 15 + 9
12x = 24
x = 24 ÷ 12
x = 24 × 1/12
x = 24/12
x = (12×2)/12
∴x = 2
经检验,6 × (2 × 2 - 1.5)= 15符合题意
答:此方程的解为x = 2
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