xy2 |
6 |
xy2 |
6 |
A.系数是-1,次数是2 | B.系数是0,次数是2 |
C.系数是-1,次数是4 | D.系数是0,次数是4 |
A.
| B.单项式xy没有系数 | ||
C.23x2是五次单项式 | D.7是单项式 |
4xy |
3 |
A.-2x(3x2y-2xy)=-6x3y-4x2y |
B.2xy2(-x2+2y2+1)=-4x3y4 |
C.(3ab2-2ab)•abc=3a2b3-2a2b2 |
D.(ab)2(2ab2-c)=2a3b4-a2b2c |
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