六x- 1.2×3=21这个方程该怎么验算?
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解:解方程, 此方程的解为x = 41/10,【即x = 4.1】
6x - 1.2 × 3 = 21
6x - (1×10+2)/10 × 3 = 21
6x - 12/10 × 3 = 21
6x - 6/5 × 3 = 21
6x - 18/5 = 21
6x = 21 + 18/5
6x = 105/5 + 18/5
6x = 123/5
x = 123/5 ÷ 6
x = 123/5 × 1/6
x = 41/10
∴x = 4.1
经检验,6 × 4.1 - 1.2 × 3 = 21符合题意
答:此方程的解为x = 41/10,【即x = 4.1】
6x - 1.2 × 3 = 21
6x - (1×10+2)/10 × 3 = 21
6x - 12/10 × 3 = 21
6x - 6/5 × 3 = 21
6x - 18/5 = 21
6x = 21 + 18/5
6x = 105/5 + 18/5
6x = 123/5
x = 123/5 ÷ 6
x = 123/5 × 1/6
x = 41/10
∴x = 4.1
经检验,6 × 4.1 - 1.2 × 3 = 21符合题意
答:此方程的解为x = 41/10,【即x = 4.1】
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