3 |
4 |
3 |
4 |
9 |
16 |
9 |
16 |
A.(x+y)(-x-y)=x2-y2 | B.(-3a2)3=-9a6 |
C.(-a+b)2=a2+2ab+b2 | D.2009×2007=20082-12 |
A.-6x2y3÷(2xy2)=-3xy | B.(-xy2)3÷(-x2y)=xy5 |
C.(-2x2y2)3÷(-xy)3=-2x3y3 | D.-(-a3b)2÷(-a2b2)=a4 |
A.0个 | B.1个 | C.2个 | D.3个 |
1 |
2 |
5 |
13 |
3 |
5 |
A.-1 | B.1 | C.0 | D.2005 |
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