x除以y(x y)减y除以x(x y)x等于根号二加一y等于根号二减一.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/15 06:38:50
![x除以y(x y)减y除以x(x y)x等于根号二加一y等于根号二减一.](/uploads/image/f/906438-30-8.jpg?t=x%E9%99%A4%E4%BB%A5y%28x+y%29%E5%87%8Fy%E9%99%A4%E4%BB%A5x%28x+y%29x%E7%AD%89%E4%BA%8E%E6%A0%B9%E5%8F%B7%E4%BA%8C%E5%8A%A0%E4%B8%80y%E7%AD%89%E4%BA%8E%E6%A0%B9%E5%8F%B7%E4%BA%8C%E5%87%8F%E4%B8%80.)
由X+Y=3XY可得X+Y-XY=2XY,用X+Y-XY替换分母中的2XY,所以(2X+2Y-XY)/(X+Y+2XY)=(2X+2Y-XY)/(2X+2Y-XY)=1
原式=(x+y)(x-y)/(x+y)²×2x(x+y)/(x+2y)=(x-y)/(x+y)×2x(x+y)/(x+2y)=2x(x-y)/(x+2y)=(2x²-2xy)/(x
【x-y-(x-y分之4y平方)】【x+y-(x+y分之4x平方)】除以【3(x+y)-x-y分之8xy】=(x-y-x+4y)(x+y-x-4x/y)/(3x+3y-x-8x)=3y*(y-4x/y
3X+XY-3Y/(X-XY-Y)?由1/X-1/Y=3得y-x=3xyx-y=-3xy则3X+XY-3Y/X-XY-Y化简为3(x-y)+xy/(x-y-xy)=3(-3xy)+xy/(-3xy-x
【x的平方-2x】除以2y-xy=x(x-2)/[-y(x-2)]=-x/y
9x^2/2y再问:貌似是负的吧再答:没看见前面的“负”…………
=(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
原式=[4(x+y)-2xy]分之[(x+y)+xy]=[4(3xy)-2xy]分之[(3xy)+xy]=10xy分之2xy=5分之1
x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x=(x-2y)(x+2y)/(x+y)²·x(x+y)/(x+2y)=x(x-2y)/(x+y)
用到求根公式再问:怎么解用一元二次方程公式法再答:再问:太给力了,你的回答完美解决了我的问题!
=3xy×(-3x/2y)=-9x²/2
原式=1÷2×√[xy/(y²/x)]=1/2×√(x²y/y²)=x√y/(2y)
【(x-y)^2+(x+y)(x-y)】除以2x=(x-y)*(x-y+x+y)/2x=(x-y)*2x/2x=x-y
1除以(1-根号下xy)
(x²+xy)/(x+y)²=x(x+y)/(x+y)²=x/(x+y)2xy/(x+y)²x/(x²-y²)∵最简公分母为:(x+y)
8x=7/y可转化为x=7/8y所以,随着y的增大,x逐渐减小,所以x、y成反比例关系再问:好那我做对了,这次考试满分,有一定的可能性了。再答:哦,原来是个数学尖子呀,幸亏我学习不错,要不就要被你鄙视
[x(x^2y^2-xy)-y(x^2-x^3y)]除以3x^2y=(x³y²-x²y-x²y+x³y²)÷3x²y=(2x
可知x≥0,y≥0(x-y)/(√x+√y)-(x-2√xy+y)/(√x-√y)=(√x+√y)(√x-√y)/(√x+√y)-(√x-√y)²/(√x-√y)=(√x-√y)-(√x-√
(xy-x²)÷xy分之x²-2xy+y²乘x²分之x-y=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y∴结果与x的值没有关系
因式分解原式=[x(x-2)]/[-y(x-2)]=-x/y