A.(+b)2-4(+b)+4=(+b-2) 2 | B.(y+5)(y-5)=y2-25 |
C.mn+2m+1=m(n+2)+l | D.x2-4x+16=(x-4) 2 |
A.(+b)2-4(+b)+4=(+b-2) 2 | B.(y+5)(y-5)=y2-25 |
C.mn+2m+1=m(n+2)+l | D.x2-4x+16=(x-4) 2 |
A.6 | B.2m-8、 | C.2m | D.-2m |
A.6 | B.2m-8、 | C.2m | D.-2m |
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