填空两个[3a^2-( )]÷(-a)=-3a+2b( )·(-2xy)=4x^2y-6xy^2

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填空两个[3a^2-(  )]÷(-a)=-3a+2b(  )·(-2xy)=4x^2y-6xy^2
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填空两个[3a^2-( )]÷(-a)=-3a+2b( )·(-2xy)=4x^2y-6xy^2
填空两个
[3a^2-( )]÷(-a)=-3a+2b
( )·(-2xy)=4x^2y-6xy^2

填空两个[3a^2-( )]÷(-a)=-3a+2b( )·(-2xy)=4x^2y-6xy^2
[3a^2-(2ab)]÷(-a)=-3a+2b
(-2x+3y)·(-2xy)=4x^2y-6xy^2

(p-2q)²-2(p+2q)(p-3q)+(p+3q)²
=p²-4pq+4q²-2p²+2pq+12q²-p²-6pq-9q²
=-2p²-8pq+7q²
(x-y+z)²-(x-y+z)(x+y-z)
=[x-(y-z)]²-[x-(y-z)...

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(p-2q)²-2(p+2q)(p-3q)+(p+3q)²
=p²-4pq+4q²-2p²+2pq+12q²-p²-6pq-9q²
=-2p²-8pq+7q²
(x-y+z)²-(x-y+z)(x+y-z)
=[x-(y-z)]²-[x-(y-z)][x+(y-z)]
=[x-(y-z)]{[x-(y-z)]-[x+(y-z)]}
=[x-(y-z)][-2(y-z)]
=-2x(y-z)+2(y-z)²
=-2xy+2xz+2y²-4yz+2z²

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