通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)

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通分2a/(2a+3)3/(3-2a)(2a+15)/(4a^2-9)通分2a/(2a+3)3/(3-2a)(2a+15)/(4a^2-9)通分2a/(2a+3)3/(3-2a)(2a+15)/(4a

通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)
通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)
通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)

通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)通分 2a/(2a+3) 3/(3-2a) (2a+15)/(4a^2-9)
2a/(2a+3)=2a(3-2a)/(3+2a)(3-2a)=(6a-4a^2)/(9-4a^2)=(4a^2-6a)/(4a^2-9)
3/(3-2a)=3(3+2a)/(3+2a)(3-2a)=(9+6a)/(9-4a^2)=(-9-6a)/(4a^2-9)
(2a+15)/(4a^2-9)不变.
三个分母都是(4a^2-9)
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