题目内容
计算下列各式:
(1)5
-9
+
;
(2)(16
-5
)+(
-
;
(3)5
(3
+4
);
(4)
•
÷
;
(5)(7
-2
)(-7
-2
);
(6)(7
-3
+24)÷
;
(7)
+
-
(a>0).
(1)5
12 |
|
1 |
2 |
48 |
(2)(16
|
|
1 |
4 |
8 |
|
(3)5
6 |
12 |
18 |
(4)
15 |
1
|
24 |
(5)(7
2 |
6 |
2 |
6 |
(6)(7
54 |
24 |
3 |
(7)
4a-4b |
(a-b)3 |
a3-a2b |
(1)原式=10
-3
+2
=9
;
(2)原式=8
-
+
-
=
-2
;
(3)原式=5
(6
+12
)=30
+60
=90
+120
;
(4)原式=
×
÷
=5÷2
=
;
(5)原式=-((7
)2+(2
)2)=24-98=-74;
(6)(21
-6
+24)÷
=21
-6
+8
=15
+8
;
(7)原式=2
+(a-b)
-a
=(2-b)
.
3 |
3 |
3 |
3 |
(2)原式=8
6 |
5
| ||
2 |
| ||
2 |
| ||
3 |
23
| ||
3 |
2 |
(3)原式=5
6 |
3 |
2 |
18 |
12 |
2 |
3 |
(4)原式=
15 |
|
24 |
6 |
5
| ||
12 |
(5)原式=-((7
2 |
6 |
(6)(21
6 |
6 |
3 |
2 |
2 |
3 |
2 |
3 |
(7)原式=2
a-b |
a-b |
a-b |
a-b |
练习册系列答案
相关题目