问题 解答题
求未知数x.
①6×3-1.8x=7.2
x
0.7
=
4
3.5
答案

①6×3-1.8x=7.2,

18-1.8x=7.2,

18-1.8x+1.8x=7.2+1.8x,

7.2+1.8x=18,

7.2+1.8x-7.2=18-7.2,

1.8x=10.8,

1.8x÷1.8=10.8÷18,

x=0.6;

x
0.7
=
4
3.5

3.5x=2.8,

3.5x÷3.5=2.8÷3.5,

x=0.8.

单项选择题
单项选择题