Помогите а 113 и 159 прошу
20/21+1/3-8/63-6/7+1/9= =60/63+21/63-8/63-54/63+7/63= =26/63 98,4-3,6=94,8 4,98-3,2=1,78 -4,88-29,4=24,52 0,144--2,5=-1,356