Пошаговое объяснение:
9/56-1/20• (3/14+1/2)= 9/56-1/20•5/7=9/56-1/4•1/7= 9/56-1/28=1/8
1) 9/56-(7/15-5/12)×(3/14+1/2)=9/56--1/20×5/7=9/56-1/4×1/7=9/56-1/28=1/8
2) (2/3+7/8-5/6)×(1--5/17)=17/24×12/17=1/2
3) 7/11×((3/7)^2+5/7)=7/11×(9/49+5/7)=7/11× ×44/49=4/7
4) (7/12-3/16-5/24)+(1/4)^2=3/16+1/16=1/4
