数学分式化简(xy-y²)分之(y×根号x +x×根号y ) -(x×根号下x-y×根号下y)分之(x+根号下
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/08 16:53:44
数学分式化简
(xy-y²)分之(y×根号x +x×根号y ) -(x×根号下x-y×根号下y)分之(x+根号下xy+y)
(xy-y²)分之(y×根号x +x×根号y ) -(x×根号下x-y×根号下y)分之(x+根号下xy+y)
(xy-y²)分之(y×根号x +x×根号y ) -(x×根号下x-y×根号下y)分之(x+根号下xy+y)
=(y√x+x√y)/(xy-y²)-(x+√xy+y)/(x√x-y√y)
=√(xy)(√x+√y)/y(x-y)-(x+√(xy)+y)/(√x-√y)(x+√(xy)+y)
=√x/√y(√x-√y)-1/(√x-√y)
=(√x-√y)/√y(√x-√y)
=1/√y
=√y/y
再问: 第2行后面为什么(x+√xy+y)/(x√x-y√y)= (x+√(xy)+y)/(√x-√y)(x+√(xy)+y)
再答: 立方差公式:a ³-b ³=(a-b)(a²+ab+b²)
再问: 那第三行√(xy)(√x+√y)/y(x-y)怎么变成了√x/√y(√x-√y)
再答: x-y=(√x+√y)(√x-√y)
=(y√x+x√y)/(xy-y²)-(x+√xy+y)/(x√x-y√y)
=√(xy)(√x+√y)/y(x-y)-(x+√(xy)+y)/(√x-√y)(x+√(xy)+y)
=√x/√y(√x-√y)-1/(√x-√y)
=(√x-√y)/√y(√x-√y)
=1/√y
=√y/y
再问: 第2行后面为什么(x+√xy+y)/(x√x-y√y)= (x+√(xy)+y)/(√x-√y)(x+√(xy)+y)
再答: 立方差公式:a ³-b ³=(a-b)(a²+ab+b²)
再问: 那第三行√(xy)(√x+√y)/y(x-y)怎么变成了√x/√y(√x-√y)
再答: x-y=(√x+√y)(√x-√y)
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