1.4x^2 - 4xy + y^2 - 44x + 22y + 40
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1.4x^2 - 4xy + y^2 - 44x + 22y + 40
2.( 1 - x^2 )( 1 - y^2 ) + 4xy
3.x^2 + x + 1 =0
2.( 1 - x^2 )( 1 - y^2 ) + 4xy
3.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
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
1.4x^2 - 4xy + y^2 - 44x + 22y + 40
x^2y+4xy+4y
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(xy-x^2)乘以(xy)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
因式分解:x×x-xy-2y×y-x-y
(-3x^y+2xy)-( )=4x^+xy
xy-[x+2y+0.5(x-4)*(y-2)]
(-x-2y)(x²-2xy+4y²)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x