5/9+1 5/7•(4 2/3-2 5/8): 1 3/4
2-3 1/7•(2-1 9/11): 8/21
2 1/3+1 1/10: (2 7/15-5/12)•5/6
4 5/12-1 1/2: (2 1/6+8/15)•1 4/5
​

Пошаговое объяснение:

5/9 +1 5/7 ·(4 2/3 -2 5/8)÷1 3/4=5/9 +12/7 ·(4 16/24 -2 15/24)·4/7=5/9 +12/7 ·2 1/24 ·4/7=5/9 +12/7 ·49/24 ·4/7=5/9 +7/2 ·4/7=5/9 +2=2 5/9

2-3 1/7 ·(2-1 9/11) ÷8/21=2 -22/7 ·(1 11/11 -1 9/11)·21/8=2 -22·2/11 ·3/8=2 -2·2·3/8=2 -3/2=2-1,5=0,5

2 1/3 +1 1/10 ÷(2 7/15 -5/12)·5/6=2 1/3 +11/10 ÷(2 28/60 -25/60)·5/6=2 1/3 +11/2 ÷2 1/20 ·1/6=2 1/3 +11/2 ·20/41 ·1/6=2 1/3 +110/41 ·1/6=2 1/3 +55/(41·3)=2 41/(41·3) +55/(41·3)=2 32/41

4 5/12 -1 1/2 ÷(2 1/6 +8/15)·1 4/5=4 5/12 -3/2 ÷(2 5/30 +16/30)·9/5=4 5/12 -27/10 ÷2 7/10=4 5/12 -27/10 ·10/27=4 5/12 -12/12=3 17/12 -12/12=3 5/12