如图,(第2题)
2018-01-07 · 知道合伙人教育行家
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解:(1)最简公分母是a²b²
1/(a²b)=b/(a²b²)
1/(ab²)=a/(a²b²)
(2)最简公分母是x(x+y)(x-y)
1/(x²-y²)=1/(x+y)(x-y)=x/[x(x+y)(x-y)]
1/(x²+xy)=1/[x(x+y)]=(x-y)/[x(x+y)(x-y)]
1/(a²b)=b/(a²b²)
1/(ab²)=a/(a²b²)
(2)最简公分母是x(x+y)(x-y)
1/(x²-y²)=1/(x+y)(x-y)=x/[x(x+y)(x-y)]
1/(x²+xy)=1/[x(x+y)]=(x-y)/[x(x+y)(x-y)]
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