Question

数学通分

Answer 1

(34)
公分母是(a-b)(b-c)
(a+b)/(a-b)(b-c)
(b+c)/(b-c)(b-a)=-(b+c)/(a-b)(b-c)
(35)
公分母是(a-b)(b-c)(a-c)
1/(a-b)(a-c)=(b-c)/(a-b)(b-c)(a-c)
1/(b-c)(b-a)=-(a-c)/(a-b)(b-c)(a-c)
1/(c-a)(b-c)=-(a-b)/(a-b)(b-c)(a-c)
(36)
公分母是a^2(a+1)(a-1)(a+2)(a-2)
1/(a^3-3a^2+2a)=a(a+1)(a+2)/a^2(a+1)(a-1)(a+2)(a-2)
2/(a^4-a^2)=2(a+2)(a-2)/a^2(a+1)(a-1)(a+2)(a-2)
-1/(a^2+a-2)=-a^2(a+1)(a-2)/a^2(a+1)(a-1)(a+2)(a-2)

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