计算(﹣3x²y)·(1 3xy²)=
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-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&