[(+1又4分之3)-(-8分之7)+(-12分之7)]/(-8分之7)怎么算
= 1+ 3/4 + 7/8 + 7/12 x 8/7
= 1+ 3/4 + 7/8 + 2/3
= ( 24 + 18 + 21 + 16) /24
= 24分之 79