问题 解答题
求下列各式中未知数x的值.
2.4
0.3
=
x
0.5
36:x=
3
2
:0.5
0.75x+
5
8
x=3.3
答案

(1)

2.4
0.3
=
x
0.5

0.3x=2.4×0.5,

0.3x÷0.3=1.2÷0.3,

x=4;

(2)36:x=

3
2
:0.5,

3
2
x=36×0.5,

3
2
x÷
3
2
=18÷
3
2

x=12;

(3)0.75x+

5
8
x=3.3,

11
8
x=3.3,

11
8
x÷
11
8
=3.3÷
11
8

x=2.4.

单项选择题
单项选择题