Ответ:

Пошаговое объяснение:

3 1/8 -(4 5/16 +1 1/4)=3 1/8 -(4 5/16 +1 4/16)=3 2/16 -5 9/16=-2 7/16=-2,4375

-7 3/5 -(-4 1/15 -5 2/3)=-7 3/5 -(-4 1/15 -5 10/15)=-7 9/15 -(-9 11/15)=-7 9/15 +9 11/15=2 2/15

-3 1/2 -(5 3/4 +2 7/20)=-3 1/2 -(5 15/20 +2 7/20)=-3 1/2 -7 22/20=-3 5/10 -8 1/10=-11 6/10=-11 3/5=-11,6

-1/3 -(-3 7/18 -5 8/9)=-1/3 -(-3 7/18 -5 16/18)=-6/18 -(-8 23/18)=-6/18 +8 23/18=8 17/18