计算(﹣3x²y)·(1 3xy²)=-搜答案-拍题作业网

-2x²y(-2xy²)²+(2xy)³·(xy²)＝-8x²y(xy²)²+8(xy)³·(xy²

x·（9x³y-3xy²)÷（﹣3x²y)=（9x³y-3xy²)÷（﹣3xy)=-3x²+y如果本题有什么不明白可以追问,请点击下面的【选

2分之3X^(3)Y-6X^(2)Y^(2）+9XY^(3)

2x+2y分之3y+x²+xy分之2xy=3y/2(x+y)+2xy/x(x+y)=3y/2(x+y)+2y/(x+y)=7y/2(x+y)如追加其它问题,再问：这道题要通分，能不能化成同分

（x^2-xy）/（xy^2）·y/（y-x）=x(x-y)/(xy^2)·y/(y-x)=(x-y)/(y^2)·y/(y-x)=-1/y再答：二十年教学经验，专业值得信赖！如果你认可我的回答，敬请

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

(4-5x-4y)xy

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

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

【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

3y/(2x+2y)+2xy/(x^2+xy)=3y/[2(x+y)]+2y/(x+y)]=(3y+4y)/[2(x+y)]=7y/[2(x+y)]

（-7x²y）（2x²y-3xy³+xy）=（-7x²y)×2x²y-（-7x²y)×3xy³+（-7x²y)×xy=-

(xy-x²）²÷（x-y)²/xy·x-y/x²=x²(y-x)²÷（x-y)²/xy·x-y/x²=x³y

这个,最后面那个减号前面是怎么回事?打括号没有?这个很重要!再问：x-y/x²是一个整体分数，3个分数，啊！！！再答：把前面分子分母同城xy然后两个合并就可以了啊！

(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

2xy[4x²y²-3y(xy+x²y)-xy²]=2xy[4x²y²-3xy²-3x²y²-xy²

6X/3XY什么意思

3y/(2x+2y)+2xy/x²+xy=3y/2(x+y)+2xy/x(x+y)=3xy+4xy/2x(x+y)=7xy/x+y

原式=(x³y-3xy²+3xy²)·（-2xy）+2x⁴y²-x³y³=x³y·（-2xy）+2x⁴y&