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5x3+2x 6x3+1 6x3+2x 6x2+2x
---3 -1
5x2+3x=8x3 6x2•3x=18x2 (﹣6x2)3=﹣36x6 6x2÷3x=2x
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)
3(x-1)=2变形得3x-1=2 7x-2=6变形得7x=-6+2 5x=6变形得x=. 变形得3x-6=2x
3x-1-2x-3=5-x 3x-1-2x+3=5-x 3x-3-2x-6=5-5x 3x-3-2x+6=5-5x
3x-2x=1 3x+2x=5x2 3x·2x=6x 3x-2x=x
3x2+2x3=5x5 2x2+3x2=5x2 2x2+3x2=5x4 2x2+3x3=6x5
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
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)
3x-1-2x-3=5-x 3x-1-2x+3=5-x 3x-3-2x-6=5-5x 3x-3-2x+6=5-5x
x2·x3=x6 (x2)3=x8 x2+x3=x5 x6÷x3=x3
3x3+5x 2x2+5x+6 2x3+5x 6x3+5x+6
={x|﹣1<x<2}, ={x|2x2﹣5x﹣3>0},则A.∩B.=( ) A.{x|﹣1<x<﹣,或2<x<3}B.{x|2<x<3} {x|﹣<x<2} {x|﹣1<x<﹣}
-3<x<-2或4<x<5 -2<x<-1或5<x<6 -3<x<-2或5<x<6 -2<x<-1或4<x<5