题目内容
计算:
(1)(
)5•(-
)•(
)7
(2)(
)-3÷(
)5.
(1)(
| x2 |
| -y |
| y2 |
| x |
| 1 |
| xy |
(2)(
| m4n-4 |
| m-1n |
| m-2n2 |
| mn-1 |
(1)(
)5•(-
)•(
)7=-
•
=-
;
(2)(
)-3÷(
)5=
×
=m-2n2•m2n-2=1.
| x2 |
| -y |
| y2 |
| x |
| 1 |
| xy |
| x 10 |
| y 5 |
| 1 |
| xy |
| x 9 |
| y 6 |
(2)(
| m4n-4 |
| m-1n |
| m-2n2 |
| mn-1 |
| m-12n 12 |
| m 3n -3 |
| m 5n -5 |
| m -10n 10 |
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