36x y的平方-25x-y的平方-搜答案-智慧作业帮

（x的平方+2xy+y的平方）（x的平方-xy+y的平方）的平方=（x²+2xy+y²）（x²-xy+y²）²=（x+y)²(x²

=x(x-y)/xy²×y/[-(x-y)]=-1/y

xy(xy+1)+(xy+3)-2(x+y+1/2)-(x+y-1)^2=xy(xy+1)+(xy+1)+2-2(x+y)-1-[(x+y)^2-2(x+y)+1]=(xy+1)^2+2-2(x+y)

y/(x²-xy)+2/(y-x)-x/(y²-xy)=[y²+2(-xy)+x²]/(x²y-xy²)=(x-y)²/[(x-y

=(xy-x的平方）除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x（x-y）×xy/（x-y）2×（x-y）/x2=-y再问：嗯

2xy/(y的平方/x)

2xy/(y^2/x)=2xy÷(y^2/x)=2xy×(x/y^2)=2x^2/y再问：O(∩_∩)O谢谢

xy(x-y)-x(x-y)平方=(x-y)[xy-x(x-y)]=(x-y)[2xy-x^2]=(x-y)*x(2x-y)-a平方+1.9b平方=(b根号1.9+a)(b根号1.9-a)-12xy+

(（x-y）(x-y))/((x-y)(x+y))=(x-y)/(x+y).

原式=x^2/xy-y^2/xy-[(x-y)y]/[(y-x)x]=x/y-y/x+y/x=x/y.

x的平方-2xy/xy-2y的平方＝x(x-2y)/y(x-2y)=x/y

原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)

x的平方y+10xy+25y=y（x²+10x+25）=y（x+5）²

把第一个式子分开来看,x的平方-8x+16+y的平方+6Y+9=0,然后就有两个完全平方了,（x-4）的平方+（y+3）的平方=0然后可以得出x=4,y=-3,然后带进去就可以得出答案

2xy×(-x的平方y)

解2xy×(-x²y)=-2x³y²a³b²/3×(-3ab²/2)²——这个吗=a³b²/3×(9a

原式=[(x²+xy)+y²][(x²+xy)+3y²]+y^4=(x²+xy)²+4(x²+xy)y²+3y^4+y^

x²+xy-6y²=0(x+3y)(x-2y)=0∴x+3y=0或x-2y=0即x=-3y或x=2y当x=-3y时(x²-2xy+4y²)/(2x²-

x^2-10xy=-100,①y^2-3xy=-40.②①*2-②*5,2x^2-5xy-5y^2=0,x=(5土√65）y/4,③代入②,[1-3(5土√65）/4]y^2=-40,（取+号）y^2

-12xy*3x^2y-x^2y*(-3xy)=-36x^3y^2+3x^3y^2=33x^3y^2

(x平方+2xy+y的平方）/（x+y)=（x+y)²/(x+y)=x+y