问题 解答题
解方程:
x
4
=30%

4+0.7x=102;
2
3
x+
1
2
x=42
答案

(1)

x
4
=30%,

x
4
×4=0.3×4,

x=1.2;

(2)4+0.7x=102,

4+0.7x-4=102-4,

0.7x=98,

0.7x÷0.7=98÷0.7,

x=140;

(3)

2
3
x+
1
2
x=42,

7
6
x=42,

7
6
7
6
=42÷
7
6

x=36.

单项选择题
问答题 简答题