求解4X²-4X+1 和-3X²+6XY-3Y²
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求解4X²-4X+1 和-3X²+6XY-3Y²
4x²-4x+1=(2x-1)²
-3x²+6xy-3y²
=-3(x²-2xy+y²)
=-3(x-y)²
-3x²+6xy-3y²
=-3(x²-2xy+y²)
=-3(x-y)²
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
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化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)