Question

номер 805 помогите срочно

Answer 1

1)2 1/2х(2/15-23/6)-2 3/4=5/(4/30-115/30)-11/4=5/2х11/30-11/4=111/12-11/=11/12-33/12=78/12=13/2=6 1/2
2)-8/7(16/20+19/20)х(41/6+28/6)=-8/7х35/20х69/6=-10/5х69/6=345/15=23
3)(51/8-22/8)х(-4)+7/18х9/1=-29/8х4/1+7/2=-29/2+7/2=-22/2=-11
4)-55/6х14/3+24/1х3/8=-385/3+9/1=-385/3+27/3=-358/3=-121 2/3

Answer 2

спасибо