题目内容
计算:
(1)
-
-|2-
|
(2)-12xy•3x2y-x2y•(-3xy)
(3)6a2b5c÷(-2ab2)2
(4)2x(
x-1)-3x(
x+
).
(1)
| 3 | -1 |
| 16 |
| 2 |
(2)-12xy•3x2y-x2y•(-3xy)
(3)6a2b5c÷(-2ab2)2
(4)2x(
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
(1)
-
-|2-
|
=-1-4-2+
=-7+
;
(2)-12xy•3x2y-x2y•(-3xy)
=-36x3y2+3x3y2
=-30x3y2;
(3)6a2b5c÷(-2ab2)2
=6a2b5c÷4a2b4
=
bc;
(4)2x(
x-1)-3x(
x+
)
=x2-2x-x2-2x
=-4x.
| 3 | -1 |
| 16 |
| 2 |
=-1-4-2+
| 2 |
=-7+
| 2 |
(2)-12xy•3x2y-x2y•(-3xy)
=-36x3y2+3x3y2
=-30x3y2;
(3)6a2b5c÷(-2ab2)2
=6a2b5c÷4a2b4
=
| 3 |
| 2 |
(4)2x(
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
=x2-2x-x2-2x
=-4x.
练习册系列答案
相关题目