题目内容
计算:
(1)
•
;
(2)
•(-
)•(-
);
(3)4
•
;
(4)
•
•(-2
)
(5)3
×(-
)÷
;
(6)
×
÷
(m>n).
(1)
| 12 |
| 72 |
(2)
| 3 |
| 2 |
| 20 |
| 15 |
| 1 |
| 3 |
| 48 |
(3)4
| ab3 |
| 1 |
| 2 |
| a3b |
(4)
| 3 |
| 10 |
|
| 5 |
| 3 |
|
|
(5)3
2
|
| 1 |
| 8 |
| 15 |
| 1 |
| 2 |
|
(6)
|
|
|
(1)原式=2
×6
=12
;
(2)原式=
×2
×(-
)×(-
)=60;
(3)原式=4b
×
a
=2a2b2;
(4)原式=-
=-5
;
(5)原式=3×
×(-
)÷
=-
;
(6)原式=
÷
=1.
| 3 |
| 2 |
| 6 |
(2)原式=
| 3 |
| 2 |
| 5 |
| 15 |
4
| ||
| 3 |
(3)原式=4b
| ab |
| 1 |
| 2 |
| ab |
(4)原式=-
|
| 6abc |
(5)原式=3×
2
| ||
| 3 |
| ||
| 8 |
| ||
| 10 |
| 15 |
| 2 |
(6)原式=
|
|
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