2(3-x)-(8+x)=6-2х-8-х=-3х-2
-4(y+5)+(12-y) =-4у-20+12-у=-5у-8
-(-7-x)+(x-5) =7+х+х-5=2+2х=2(1-х)
1 2/5 *(-2 1/7)*1/6=8/5*(-15/7)*1,6=
-24/7*1/6=- 4/7
3 1/8(-1 3/5)*(-4/15)=25/8*(-8/5)*(-4/15)= (-5)*(-4/15)=4/3=1 1/3
7 8/9* 71/33*(-1 2/5)=80/9*71/33*(-7/5)= 5860/297*(-7/5)= - 7952/297= - 26,7
Ответ:
Пошаговое объяснение:
-3/5+(-1/5)=-4/5
-2/3+(-3/5)=-10/15+(-9/15)=-19/15=-1 4/15
-4/5+(-5/6)=-24/30+(-25/30)=-49/30= -1 19/30
- 3 1/7+(-1 3/14)= -22/7+(-17/14)=-44/7+(-17/14)=-61/14 =- 4 5/14
1) (5+8)х6-4=74 2) (5+8)х6+4=82 3) (5+8)х6х4=312