Question

(2,5/6+2,2/9)÷3,1/4-2/7÷9/7

Answer 1

(2,5/6+2,2/9)÷3,1/4-2/7÷9/7
(5/2/6+11/5/9):0.775-2/7*7/9
(5/12+11/45):31/40-2*1/9
119/180*40/31-2/9
119/9*2/31-2/9
238/279-2/9
176/279 (≈0.630824)

Answer 2

1)2,56-2,29=(7,5+4,4)18=11,918
2)11,918:3,14=11,418•43,1=23,827,9
3)27:79=27•97=29
4)23,827,9-29=23,8-6,227,9=17,627,9