作业帮-(13又1/3)/5+(-5又2/3)/5+(-(-196又1/7)/5+(-76又1/7)/5
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-(13又1/3)/5+(-5又2/3)/5+(-(-196又1/7)/5+(-76又1/7)/5
-(13又1/3)/5+(-5又2/3)/5+(-(-196又1/7)/5+(-76又1/7)/5
-(13又1/3)/5+(-5又2/3)/5+(-(-196又1/7)/5+(-76又1/7)/5
令上式=x
等式两边同乘以5
则5x=-(13又1/3)-(5又2/3)+196又1/7-76又1/7=-19+120=101
x=101/5 即20又1/5
-338/8