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-x>-y a2x>a2y -x+a<-y+a x>-y
﹣3x2y 2xy2 yx2
xy+2=1 (x2+5)x=0 x2﹣4x﹣5 x2=0
xy+2=1 (x2+5)x=0 x2-4x-5 x2=0
3x+5y=8xy 3y2-y2=3 15ab-15ba=0 7x3-6x2=x
x2﹣5x+6=x(x﹣5)+6 x2﹣5x+6=(x﹣2)(x﹣3) (x﹣2)(x﹣3)=x2﹣5x+6 x2﹣5x+6=(x+2)(x+3)
5a+2b=7ab 7ab-7ba=0 4x2y-5x2=-xy 3x2+5x3=8x5
﹣x>y a2x>a2y ﹣x+a<﹣y+a x>﹣y
)x+y<0 ( )x+y>0 ( )x-y<0 ( )x-y>0
3x=2y xy=6
x-7 =7 4x-7y=6 2x-6=0
x+y=5 xy=7 x=y
(x-6)(x+1) (x+6)(x-1) (x-2)(x+3) (x+2)(x-3)
f(x+π)=sin x f(2π-x)=sin x f(π-x)=-f(x)
3xy与-2yz是同类项 5xy与6yx是同类项 2x与x2是同类项 2x2y与2xy2是同类项