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解
最简公分母为(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)
最简公分母为:6a²bc
∴a/2b=3a³c/(6a²bc)
1/3a²=2bc/(6a²bc)
-5/6abc=-5a/(6a²bc)
最简公分母为(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)
最简公分母为:6a²bc
∴a/2b=3a³c/(6a²bc)
1/3a²=2bc/(6a²bc)
-5/6abc=-5a/(6a²bc)
追问
b/a²-ab,a/b²-ab,ab/a²-b²,对下答案,答案就行
追答
最简公分母为:
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)
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