作业帮4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
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4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
4-4x^2+4xy-y^2; -4xy+4y^2-2x+4y+1因式分解
4-4x^2+4xy-y^2
=4-(4x²-4xy+y²)
=2²-(4x-y)²
=(2-4x+y)(2+4x-y)
-4xy+4y^2-2x+4y+1
=4y²+4y+1-4xy-2x
=(2y+1)²-2x(2y+1)
=(2y+1)(2y-2x+1)
4-4x²+4xy-y²=4－﹙4x²－4xy＋y²﹚=2²－﹙2x－y﹚²=﹙2＋2x－y﹚﹙2－2x＋y﹚
-4xy+4y²-2x+4y+1=4y²+4y+1－﹙4xy+2x﹚=﹙2y＋1﹚²－2x﹙2y＋1﹚=﹙2y＋1﹚﹙2y＋1－2x﹚
(x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy)
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
（X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程
已知 x+y＝4,xy＝2,求2xy+4xy+2xy
(-3xy+2xy)-(4xy+xy)
（-3x^y+2xy)-( )=4x^+xy
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x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
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5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
3（x平方y+xy)-4(xy-2x平方y)-(xy)
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