A.4a-3a=1B.(a-3)2=a2-9C.(a+b)(a-b)=a2-b2D.(a+b)2=a2+b2
A.x3·y3=(xy)6B.(-2x2)·(-3x3)=6x6C.x2+x2=2x2D.(a-1)2=a2-12
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