问题 解答题
计算下列各式:
(1)5
12
-9
1
3
+
1
2
48

(2)(16
3
2
-5
1
2
)+(
1
4
8
-
2
3
)

(3)5
6
(3
12
+4
18
)

(4)
15
1
2
3
÷
24

(5)(7
2
-2
6
)(-7
2
-2
6
)

(6)(7
54
-3
24
+24)÷
3

(7)
4a-4b
+
(a-b)3
-
a3-a2b
(a>0)
答案

(1)原式=10

3
-3
3
+2
3
=9
3

(2)原式=8

6
-
5
2
2
+
2
2
-
6
3
=
23
6
3
-2
2

(3)原式=5

6
(6
3
+12
2
)=30
18
+60
12
=90
2
+120
3

(4)原式=

15
×
5
3
÷
24
=5÷2
6
=
5
6
12

(5)原式=-((7

2
)2+(2
6
)
2
)=24-98=-74;

(6)(21

6
-6
6
+24)÷
3
=21
2
-6
2
+8
3
=15
2
+8
3

(7)原式=2

a-b
+(a-b)
a-b
-a
a-b
=(2-b)
a-b

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