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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