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3x+3y=6xy x+x=x2 16y2﹣9y2=7 9a2b﹣9ba2=0
={x||x|≤3}, ={x|x<-2或x>5},那么如图所示的阴影部分所表示的集合为( ) A.[-3,5)B.[-2,3] [-3,-2) (-∞,3]∪[5,+∞)
9x﹣y﹣16=0 9x+y﹣16=0 6x﹣y﹣12=0 6x+y﹣12=0
x2-9+6x=(x+3)(x-3)+6x (x+5)(x-2)=x2+3x-10 x2-8x+16=(x-4) 2 -6a2b=-3a﹒2ab
9x3﹣4x2, 9x4+4, 9x3+4x, 9x4﹣4
(x+3)2=25 (x﹣3)2=25 (x+3)2=16 (x+9)2=25
3x2 – 5=2x 16x=9x2 x(x –7)=0 (x+5)(x-5)=0
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
3500x1000x16% 3500x1000x(1-9%)x16% 3500x1000x(1-9%)/(1+16%)x16% 3500x1000/(1+16% )x16%
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
x2-6x-9 x2-4x-16 x2+6x+9 x2+4x+16
3x+3y=6xy 16y2 -7y2 =9 -(x-6)=-x+6 3(x-1)=3x-1