题目内容
计算;
(1)(-
)2•(-
)3•(-
)4;
(2)4x2y÷(
)2;
(3)(
)3÷(-b6c);
(4)-
÷
•
;
(5)
•
÷
.
(1)(-
| x2 |
| y |
| y2 |
| x |
| 1 |
| x |
(2)4x2y÷(
| 2x |
| -y |
(3)(
| b2 |
| ac |
(4)-
| x-y |
| x+2y |
| x2-y2 |
| x2+4xy+4y2 |
| x-y |
| x+2y |
(5)
| m2-n2 |
| (m-n)2 |
| (n-m)2 |
| m2n2 |
| m+n |
| m |
(1)原式=
•(-
)•
=-
;
(2)原式=4x2y•
=y3;
(3)原式=
•
=-
;
(4)原式=-
•
•
=-
;
(5)原式=
•
•
=
.
| x4 |
| y2 |
| y6 |
| x3 |
| 1 |
| x4 |
=-
| y4 |
| x3 |
(2)原式=4x2y•
| y2 |
| 4x2 |
=y3;
(3)原式=
| b6 |
| a3c3 |
| 1 |
| -b6c |
=-
| 1 |
| a3c4 |
(4)原式=-
| x-y |
| x+2y |
| (x+2y)2 |
| (x+y)(x-y) |
| x-y |
| x+2y |
=-
| x-y |
| x+y |
(5)原式=
| (m+n)(m-n) |
| (m-n)2 |
| (m-n)2 |
| m2n2 |
| m |
| m+n |
=
| m-n |
| mn2 |
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