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x=3,y=2
x=3,y=2 x=2,y=3
x=3,y=2 x=2,y=3
x=2,y=3 x=3,y=2
x=2,y=3
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
(x+2y-3z)(x-2y-3z). (x-2y-3z)(x-2y+3z) (x+2y+3z)(x+2y-3z). (x+2y+3z)(x-2y-3z)
(x,3)与点 (2,y)关于x轴对称,则( ) A.x=-2,y=-3; B.x=2,y=3; x=-2,y=3; x=2,y=-3
y=2x+3 y=2x﹣3 y﹣3=2x+3 y=3x﹣3
3(x+y2)(x-y2) 3(x+y2)(x+y)(x-y) 3(x-y2)2 3(x-y)2(x+y)2
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
x=3,y=2 x=3,y=2 x=2,y=3 x=3,y=2 x=2,y=3 x=2,y=3 x=3,y=2 x=2,y=3
y=2x+3 y=2x-3 y-3=2x+3 y=3x-3
-2x+3y 2x-3y -2x-3y 2x+3y
x=3,y=2 x=3,y=2 x=2,y=3 x=3,y=2 x=2,y=3 x=2,y=3 x=3,y=2 x=2,y=3
x(3x+y)(x-3y) 3x(x2-2xy+y2) x(3x-y)2 3x(x-y)2
y=﹣3x+2 y=﹣3x﹣2 y=﹣3(x+2) y=﹣3(x﹣2)
3x+y>2 3(x+y)>2 3x+y≥2 3(x+y)≥2
5x﹣(x﹣2y)=5x﹣x+2y 2a2+(3a﹣b)=2a2+3a﹣b (x﹣2y)﹣(x2﹣y2)=x﹣2y﹣x2+y2 3x2﹣3(x+6)=3x2﹣3x﹣6
-2X—Y.—Y+3 —2X+3 2X+3 -2X—2Y+3
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
If x<0 Then y=0 If x<1 Then y=1 If x<2 Then y=2 If x>=2 Then y=3 If x>=2 Then y=3 If x>1 Then y=2 If x>=0Then y=1 If x>0 Then y=0 If x<0 Then y=0 Else If>=0Then y=1 Else y=3 End If If x>=2 Then y=3 Else If>=1 Then y=2 Else y=0 End If