1.4x^2 - 4xy + y^2 - 44x + 22y + 402.( 1 - x^2 )( 1 - y^2 ) + 4xy3.x^2 + x + 1 =0
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1.4x^2-4xy+y^2-44x+22y+402.(1-x^2)(1-y^2)+4xy3.x^2+x+1=01.4x^2-4xy+y^2-44x+22y+402.(1-x^2)(1-y^2)+4x
1.4x^2 - 4xy + y^2 - 44x + 22y + 402.( 1 - x^2 )( 1 - y^2 ) + 4xy3.x^2 + x + 1 =0
1.4x^2 - 4xy + y^2 - 44x + 22y + 40
2.( 1 - x^2 )( 1 - y^2 ) + 4xy
3.x^2 + x + 1 =0
1.4x^2 - 4xy + y^2 - 44x + 22y + 402.( 1 - x^2 )( 1 - y^2 ) + 4xy3.x^2 + x + 1 =0
1 分组 然后 十字相乘
原式= (2x-y)^2-22(2x-y)+40
=(2x-y-2)(2x-y-20)
2 分组 然后 完全平方 然后平方差
原式=1-y^2-x^2+x^2y^2+4xy
=（x^2y^2+2xy+1)-(x^2-2xy+y^2)
=(y+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
3
这个无解的阿,x^2就大于等于0了,再+个1,还能等于0?非要解就这样
用配方
[x^2+x+(1/4)]-(1/4)+1=0
(x+ 1/2)^2=-3/4
(x+ 1/2）^2=根号-3/4
所以无解
(x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy)
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
（X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程
（-3x^y+2xy)-( )=4x^+xy
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
3(x^2y+xy)-4(xy-2x^2y)-(-xy)
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
当x-y=2xy时,求4x-3xy-4y/xy
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
3（x平方y+xy)-4(xy-2x平方y)-(xy)
1-2/x+y=xy,4y+6x=xy.求xy的解?
计算:2xy/(x+y)².(x+y)/4y
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2