3 1/9+(5 2/7)= ? -4 3/11+7 2/10=? -8 2/7* 9 3/5=?

31 52 1 3 1 + 3 1--- + ---- = 3 --- + 7 --- = 10-------- = 10------ 9 7 9 7 9 + 7 10 43 72 10 2 10 + 2 2- ----- + ---- = -3 ----- + 7 ---- = 4 ----------- = 4 ---- 11 10 11 10 11 + 10 11 82 93 5 3 5 + 3 3- ----- × ----- = - 11 --- × 18 ----- = 7 --------- = 7 ---- 7 5 7 5 7 + 5 7