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x=4,y=3;x=7,y=8 x=3,y=4;x=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
x=4,y=3;x=7,y=8 x=3,y=4;x=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
x=4,y=3;x=7,y=8 x=3,y=4;X=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
(﹣5b)3=﹣15b3 (2x)3(﹣5xy2)=﹣40x4y2 28x6y2+7x3y=4x2y (12a3﹣6a2+3a)÷3a=4a2﹣2a
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
x=4,y=3;x=7,y=8 x=3,y=4;x=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
x=4,y=3;x=7,y=8 x=3,y=4;x=7,y=8 x=7,y=8;x=4,y=3 x=8,y=7;x=7,y=8