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5xy﹣4xy=1 3x2+2x3=5x5 x2﹣x=x 3x2+2x2=5x2
a(x+y)=ax+ay x2﹣4x+4=x(x﹣4)+4 10x2﹣5x=5x(2x﹣1) x2﹣16+3x=(x﹣4)(x+4)+3x
2(2x+1)﹣3(5x﹣3)=1 2x+1﹣5x﹣3=6 2(2x+1)﹣3(5x﹣3)=6 2x+1﹣3(5x﹣3)=6
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
a (x + y) =a x + a y x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+3x=(x-4)(x+4)+3x
(x-2)(3-5x) (x-2)(-3-5x) x(x-2) (x-2)(3+5x)
2x+3y=5xy 3x﹣x=3 2x+3x=5x2 ﹣x2﹣x2=﹣2x2
3x-2x=1 3x+2x=5x2 3x·2x=6x 3x-2x=x
3x2+2x3=5x5 2x2+3x2=5x2 2x2+3x2=5x4 2x2+3x3=6x5
x2﹣5x+3 ﹣x2+x﹣1 ﹣x2+5x﹣3 x2﹣5x﹣13
2x=5x+3 2x=5x﹣3 3x=5x+3 3x=5x﹣3