能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____(看不懂题目的话有附图)能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____如看不懂题目则看图~

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能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____(看不懂题目的话有附图)能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____如看不懂题目则看图~

能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____(看不懂题目的话有附图)能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____如看不懂题目则看图~
能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____(看不懂题目的话有附图)
能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____
如看不懂题目则看图~

能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____(看不懂题目的话有附图)能使1/(a+1)+1/(a+2)+1/(a+3)=13/12成立的正整数a是____如看不懂题目则看图~
只知道a=1,填空题有时候就是靠凑的,要过程很麻烦,也浪费时间