问题 解答题
(1)计算:
20
+
8
-
45
+
32

(2)计算:|
3
-4|-22+
12

(3)
2
3
9x
+6
x
4

(4)a2
8a
+3a
50a3
答案

(1)原式=2

5
+2
2
-3
5
+4
2

=6

2
-
5

(2)原式=4-

3
-4+2
3

=-

3
+2
3

=

3

(3)原式=

2
3
×3
x
+6×
1
2
x

=2

x
+3
x

=5

x

(4)原式=a2×2

2a
+3a×5a
2a

=2a2

2a
+15a2
2a

=17a2

2a

单项选择题 A1/A2型题
问答题