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 |
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