计算(x y-1)(x-y 1)-搜答案-智慧作业帮

2分之3X^(3)Y-6X^(2)Y^(2）+9XY^(3)

(3x的平方+2xy-2分之1x)-(2x的平方-xy+x)=3x+2xy-x/2-2x+xy-x=x+3xy-3x/2

1.x^4+5x^2-6=(x^2+6)(x^2-1)=(x^2+6)(x-1)(x+1)2.(x+y)(x+y+2xy)+(xy+1)(xy-1)=(x+y)^2+2xy(x+y)+(xy+1)(x

3xy[2xy-x(y-2)+x-1]=3xy(2xy-xy+2x+x-1)=3xy(xy+3x-1)=3x^2y^2+9x^2y-3xy

3xy[2xy-x（y-2）+x]＝3xy[2xy-xy+2x+x]=3xy(xy+3x)=3x²y²+9x²y

18(4x²-xy)-19(4x²-xy)+(4x²-xy-1)=72x²-18xy-76x²+19xy+4x²-xy-1=-4x²

这题少括号了吧.

(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3=-(x-y)^3[-(xy-5)/x^2(x-y)]/[(xy-5)/xy]=(x-y)^3(xy-5)xy/x^2(x-y)(x

原式=(1-x²y²）（x²y²+1）=（1-x四次方y四次方）请指出,希望能和你一起探讨~如果认为我的回答好,请及时采纳,

再问：写清楚点？

-x/y再问：你确定？再问：等会吧再答：这么简单的问题再问：呵呵再问：算了

（-3x^y)(1/3xy^2)=-3*1/3*x^3y^3=-x^3y^3

【x²+xy/（x-y）】/【xy/（x-y）】=【x²（x-y）/（x-y）+xy/（x-y）】/【xy/（x-y）】={【x²（x-y）+xy】/（x-y）}/【xy

(1).(-2xy²)*(3x²y)²=(-2xy²)*(9x^4y²)=-18x^5y^4(2).(-a)²(2-3ab)=a²

原式=-x²y³+3x²y³=2x²y³

直接分开相乘结果为xy（x^-1)+xy(y^-1)]=x+y

(3x^3y-x^2y+1/2xy)÷(-1/2xy）=[x^2y(3x-1)+1/2xy]*(-2xy)=-2x^3y^2(3x-1)-1=2x^3y^2-6x^4y^2-1

（xy-x²）乘（x-y）分之xy=-x(x-y)乘[(x-y)分之xy]=-x²y

（-3x^2y)(1/3xy^2)=-x^3y^3

-3(2X²-XY)+4(X²+XY-6)=-6X²+3XY+4X²+4XY-24=-2X²+7XY-245(X-2Y)²-X+2Y-60=