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f(x,y)=3(x+y)+32xy f(x,y)=3(x+y)-32xy f(x,y)=3(x+y)-16xy f(x,y)=3(x+y)+16xy
(﹣2a2b3)÷(﹣2ab)=a2b2 (3x2y﹣6xy)÷6xy=0.5x (21x5y2﹣9x4y3)÷3x3y2=7x2﹣3xy (3x2y+xy)÷xy=3x
4xy+xy=5xy x+2x=2x² 5xy-3xy=2 x+y=xy
f(x,y)=3(x+y)+32xy f(x,y)=3(x+y)-32xy f(x,y)=3(x+y)-16xy f(x,y)=3(x+y)+16xy
(x+y)2=x2+y2 (x﹣y)2=x2﹣2xy﹣y2 (x+2y)(x﹣2y)=x2﹣2y2 (﹣x+y)2=x2﹣2xy+y2
(x+y)2=x2+y2 (x﹣y)2=x2﹣2xy﹣y2 (x+2y)(x﹣2y)=x2﹣2y2 (﹣x+y)2=x2﹣2xy+y2
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
﹣2x+3x=x 6xy2÷2xy=3y (﹣2x2y)3=﹣6x6y3 2xy2•(﹣x)=﹣2x2y2
2x2-xy-x=2x(x-y-1) -xy2+2xy-3y=-y(xy-2x-3) x(x-y)-y(x-y)=(x-y)2 x2-x-3=x(x-1)-3