A.22005 | B.-2 | C.-22005 | D.-1 |
A.M>N | B.M<N | C.M=N | D.不能确定 |
A.3m2-6m=m(3m-6) | B.a2b+ab+a=a(ab+b) |
C.-x2+2xy-y2=-(x-y)2 | D.x2+y2=(x+y)2 |
A.(a-b)2 | B.(a+b)2 | C.(a2-b2)2 | D.a2-b2 |
1 |
4 |
A.2个 | B.3个 | C.4个 | D.5个 |
A.x2-y | B.x2+y2 | C.-x2+y2 | D.-x2-y2 |
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