1.4x5-6 x=2.8 检验？

Question

如题所述

Answer 1

1.4x5-6x=2.8
7-6x=2.8
6x=7-2.8
6x=4.2
x=0.7
检验:把x=0.7代入方程得
1.4x5-6x0.7=2.8
7-4.2=2.8
2.8=2.8，
左边=右边，所以x=0.7是原方程的解。

Answer 2

1.4×5-6x=2.8
解7-6x=2.8
-6x=-4.2
x=0.7
检验
1.4×5-6×0.7=7-4.2=2.8

Answer 3

1.4x5-6 x=2.8
6x=1.4x5-2.8
6x=7-2.8
x=4.2/6
x=6.7。