题目内容
计算:(
x2y-6xy)•(
xy)
| 2 |
| 3 |
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| 2 |
(
x2y-6xy)•(
xy),
=
×
x2+1y2-6×
x2y2,
=
x3y2-3x2y2.
| 2 |
| 3 |
| 1 |
| 2 |
=
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
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=
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| 3 |
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