解最簡公分母為(x-y)(x+y)∴1/(x-y)=(x+y)/(x-y)(x+y)=(x+y)/(x²-y²)1/(x+y)=(x-y)/(x-y)(x+y)=(x-y)/(x²-y²)最簡公分母為：6a²bc∴a/2b=3a³c/(6a²bc)1/3a²=2bc/(6a²b...b/a²-ab，a/b²-ab，ab/a²-b²，對(duì)下答案，答案就行最簡公分母為：ab(a-b)(a+b)∴b/(a²-ab)=b²(a+b)/ab(a-b)(a+b)a/(b²-ab)=-a/(ab-b²)=-a²(a+b)/ab(a-b)(a+b)ab/(a²-b²)=a²b²/ab(a+b)(a-b)