Номер 1270 только 1 ○~○

(6 1/8-1,75): (9-2,2* [5 6/11-3,5])* 1 2/7= 1 17/28. __________________________________________ По действиям; 1)) (6 1/8-1,75)= (6*8+1)/8- 1 3/4= 49/8- (4*1+3)/4= 49/8- 7/4= (49-7*2)/8=(49-14)/8=35/8; ______________________________________ 2)) [5 6/11- 3,5]= (5*11+6)/11- 3 1/2= 61/11- (2*3+1)/2= 61/11- 7/2= (61*2-7*11)/(11*2)= (122-77)/22= 45/22= 2 1/22; ______________________________________ 3)) 2,2* 2 1/22= 2 1/5* 45/22= 11/5* 45/22= 1/1* 9/2= 9/2= 4 1/2; _______________________________________ 4)) 9- 4 1/2= 9/1- 9/2= 18/2-9/2= 9/2= 4 1/2; _______________________________________ 5)) 35/8: 4 1/2= 35/8: 9/2= 35/8* 2/9= 35/4* 1/9=35/36; ______________________________________________ 6)) 35/36* 1 2/7= 35/36* 9/2= 17/4* 1/1= 17/4= 4 1/4.