A.10 | B.11 | C.12 | D.13 |
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A.(2x+1)(x+2)=2x2-3x-2 | B.a2-2ax+2x2=(a-x)2+x2 |
C.9-a2=(3+a)(3-a) | D.(y-2)(y-1)=(2-y)(1-y) |
A.4xy3+4x2y2 | B.4xy3-4x2y2 |
C.-4xy3+4x2y | D.-4xy3-4x2y2 |
1 |
4 |
A.(x+1)(x-1)=x2-1 | B.ab-a2=a(b-a) | ||||
C.(m-n)(x-y)=(x-y)(m-n) | D.3m2-2m+3=3m(m2-
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