问题 解答题
求未知数x.
12-5x=6.5
2
3
x+
1
2
x=42.
答案

12-5x=6.5

5x=12-6.5

5x=5.5

x=5.5÷5

x=1.1;

2
3
x+
1
2
x=42

2
3
+
1
2
)x=42

7
6
x=42

x=42÷

7
6

x=36.

填空题
单项选择题 A1/A2型题