A.4 | B.-4 | C.64 | D.-64 |
|
A.字母相同并且字母的指数也相同的项是同类项 |
B.分解因式-81a2-b2=-(9a-b)(9a+b) |
C.若(y2)m(xn+1)2÷xny=x3y3,则m=2,n=1 |
D.已知x2-2mx+1是完全平方式,则m=1 |
A.0 | B.2a2 | C.-4a2 | D.-6a2 |
A.8x2+3y2=11x2y2 | B.4x2-9x2=-5x2 |
C.5a2b-5ba2=0 | D.3m-(-2m)=5m |
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