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y(x2-2xy+y2) x2y-y2(2x-y) y(x-y)2 y(x+y)2
(x-2y)(2y+x) (-2y-x)(x+2y) (x-2y)(-x-2y) (2y-x)(-x-2y)
(x﹣2y)(2y+x) (﹣2y﹣x)(x+2y) (x﹣2y)(﹣x﹣2y) (2y﹣x)(﹣x﹣2y)
y(x2﹣2xy+y2) x2y﹣y2(2x﹣y) y(x﹣y)2 y(x+y)2
y=cy1(x)+y2(x) y=y1(x)+c2y2(x) y=c[y1(x)+y2(x)] y=c1y(x)-y2(x)
x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
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 (x﹣y)2 y (x + y)(x﹣y) y (x + y)2 y (x2﹣2xy + y2)
(x+2y)(2x-y) (x+y)(x-2y) (x+2y)(2y-x) (x-2y)(2y-x)
x=1,y=1 x=2,y=2 x=2,y=1 x=1,y=1 x=1,y=1 x=1,y=1 x=2,y=1 x=2,y=1
若x,y∈R且x2+y2≠0,则x,y全不为0 若x,y∈R且x2+y2≠0,则x,y不全为0 若x,y∈R且x,y全为0,则x2+y2=0 若x,y∈R且xy≠0,则x2+y2≠0
﹣(2x+y)=﹣2x+y 2(x﹣y)=2x﹣y 3x﹣(2y+z)=3x﹣2y﹣z x﹣(﹣y+z)=x﹣y﹣z
“若x22” “若x>y,则x2>y2” “若x≤y,则x2≤y2” “若x≥y,则x2≥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
x1=2 y1=2 x2=2 y2=1 x1=2 y1=2 x2=2 y2=2 x1=2 y1=1 x2=2 y2=2 x1=2 y1=1 x2=2 y2=1
y=cy1(x)+y2(x) y=y1(x)+c2y2(x) y=c[y1(x)+y2(x)] y=c1y(x)-y2(x)
c1y1+c2y2 c1Y1(x)+c2Y2(x) c1y1+c2y2+Y1(x) c1y1+c2y2+Y1(x)+Y2(x)
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