计算(-2x分之3y)的平方×(3y分之2x)的平方
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[3a^3/(x+y)]^3*(x^2-y^2)/[(y-x)/(x+y)]^2=27a^9/(x+y)^3*(x+y)*(x-y)*(x+y)^2/(x-y)^2=27a^9/(x-y)
(2x的平方分之y)的-2次方除以(-4x分之y的平方)的-2次方=4x的4次方/y²×y的4次方/16x²=x²y²/4
x的平方+2xy+y的平方分之x的平方-4y的评方÷x的平方+xy分之x+2y=(x+2y)(x-2y)/(x+y)²×x(x+y)/(x+2y)=x(x-2y)/(x+y)=(x²
(x³+3x²y-9xy²)-1/2(6x²y+4x²)=x³+3x²y-9xy²-3x²y-2x²
=8x²y^4×3x/(-4y³)×(-2)/x²y=12x
2x/(x^2-4)=2x/((x-2)*(x+2))最简公分母是x*(x-2)*(x+2)1/(x-1)-1/(x+1)-2/(x^+1)=(x+1-x+1)/(x^2-1)-2/(x^+1)=2/
=[x(x+y)-y(x-y)+2xy]/(x+y)(x-y)=(x²+xy-xy+y²+2xy)/(x+y)(x-y)=(x+y)²/(x+y)(x-y)=(x+y)/
先简化,再代入,(x-y)/(x-3y)=2/7,另外一个种,直接代入计算再问:详细一点。。。再答:x/2=y/3,那么y=3x/2,代入方程式,可以得出2/7(x^2-y^2)/(x^2-2xy-3
第2题我来回答吧:由X+2Y=(2X+1)/3X+2Y=(Y-X)/4得:3X+6Y=2X+14X+8Y=Y-X即:X=1-6Y5X+7Y=0消去X,得:23Y=5所以Y=5/23,X=-7/23
3根号xy分之2根号x的平方y=2√x²y/3√xy=2√x/3;您好,答题不易如有帮助请采纳,谢谢!
x(y-x)÷(x²-2xy+y²)/xy×(x-y)/x²=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y
(8x^2/9y^2)*(3y/-4x)=-2x/3y不懂请追问,满意请采纳~再问:过程????再答:就相当于(8x的平方除以-4x)乘以(3y除以9y的平方)=-2x乘以3y分之一=负的3y分之2x
2(x平方-6分之7y)平方分之(x-3分之2y)平方
(3分之2x-y)(3分之2x+y)=(2x/3)²-y²=4x²/9-y²打字不易,再问:=4x²/9-y²中间的‘\’是什么意思
[1]y+2分之y的平方-6y+9除以[3-y]=(3-y)²/(y+2)×/(3-y)=(3-y)/(y+2)[2]x的立方分之x的平方y乘以[-y分之1]=x²y/x³
y的立方分之x的平方y÷-x分之2y=y的立方分之x的平方yX-2y分之x=-2y的立方分之x的立方
大哥那个平方是整体的平方还是那6x-4y分之1-8y的平方,题目说清楚点
原式等于:1/[X(X+2Y)].再问:过程再答:原式等于:(x²-4y²)/(x²+4xy+4y²)÷(x²-2xy)=(x²-4y
*(x-2y+3分之1)的平方=x^2+(2y)^2+(1/3)^2-2x*2y+2x*(1/3)-2y*(1/3)=x^2+4y^2+1/9-4xy+(2/3)x-(2/3)y
x-y分之2x的平方-y-x分之x的平方-4xy+x-y分之2y的平方-x的平方=2x/(x-y)-(x²-4xy)/(y-x)+(2y-x²)/(x-y)=(2x+x²