问题 解答题
5.5-x=2
3
4
x:0.75=
5
6
2x+30%x=9.2.
答案

(1)5.5-x=2

3
4

5.5-x+x=2

3
4
+x,

2

3
4
+x=5.5,

2

3
4
+x-2
3
4
=5.5-2
3
4

x=2.75;

(2)x:0.75=

5
6

x÷0.75=

5
6

x÷0.75×0.75=

5
6
×0.75,

x=0.625;

(3)2x+30%x=9.2,

2.3x=9.2,

2.3x÷2.3=9.2÷2.3,

x=4.

单项选择题
单项选择题