问题 解答题
求未知数x
①0.36×5-2x=0.4       
18
Χ
=
7.2
8
答案

(1)0.36×5-2x=0.4,

1.8-2x=0.4,

1.8-2x+2x=0.4+2x,

0.4+2x-0.4=1.8-0.4,

2x÷2=1.4÷2.

x=0.7;

(2)

18
x
=
7.2
8

7.2x=18×8,

7.2x÷7.2=144÷7.2,

x=20.

判断题
判断题