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(2a+b)(2b﹣a) (x+1)(﹣x﹣1) (3x﹣y)(﹣3x+y) (﹣x﹣y)(﹣x+y)
y2-(6x-y+3z)=y2-6x-y+3z 9y2-[x-(5z+4)]=9y2-x+5z+4 x+[-6y+(5z-1)]=x-6y-5z+1 -(7x+y)+(z+4)=-7x-y-z-4
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
x-3y+7=0 x-3y+13=0 2x-y+7=0 3x-y-5=0
7a+a=7a2 3x2y-2yx2=x2y 5y-3y=2 3a+2b=5ab
3x+3y=6xy 7x﹣5x=2 ﹣y﹣y=﹣2y ﹣2a+3a=﹣5a
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
if(x>=0) y=sqrt(x); else y=sqrt(-x); y=sqrt(x); if(x<0) y=sqrt(-x); if(x>=0)y=sqrt(x); if(x<0) y=sqrt(-x); y=sqrt(x>=0x:-x);
x﹣2y﹣7=0 2x+y+1=0 2x﹣y﹣5=0 x+2y+5=0
3a-2b=ab 5y-3y=2 7a+a=7a2 3x2y-2yx2=x2y
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
7a+a=7a2 5y﹣3y=2 3x2y﹣2yx2=x2y 3a+2b=5ab
(x-5)2+(y+7)2=25 (x-5)2+(y+7)2=17或(x-5)2+(y+7)2=15 (x-5)2+(y+7)2=9 (x-5)2+(y+7)2=25或(x-5)2+(y+7)2=9
if(x>0)y=1;
else if(x= =0)y=0;
else y=-1; y=0;
if(x>0)y=1;
else if(x<0)y=-1; y = 0;
if (x> = 0)
if (x>0) y = 1;
else y = -1; if ( x > = 0)
if ( x>0)y = 1;
else y = 0;
else y = -1;
x-3y+7=0 x-3y+13=0 2x-y+7=0 3x-y-5=0
3x2y﹣2yx2=x2y 5y﹣3y=2 7a+a=7a2 3a+2b=5ab
(x﹣5)2+(y+7)2=25 (x﹣5)2+(y+7)2=3或(x﹣5)2+(y+7)2=15 (x﹣5)2+(y+7)2=9 (x﹣5)2+(y+7)2=25或(x﹣5)2+(y+7)2=9