2⅓: 4: 9-15,4·0,772= [3 (7: 11)-5·2(7/22)]·0,08+1: 1⁴/7=

Объяснение:

1.

1)7/3:4/9=7/3*9/4=21/4=5,25

2)15,4*0,772=11,8888

3) 5,25-11,8888=-6.6388

2.

1)5*2 7/22=255/22

2)3 7/11-255/22=40/11-255/22=80/22-255/22= -175/22

3) -175/22* 8/100=-175/22*2/25= -7/11

4)1:1⁴/7=1:1/7=1*7/1=7

5)-7/11+7=7 -  7/11= 6 11/11 -7/11=6 4/11