1)(1/4-2/3)*(4/5-2/15)*(-3/5) 2)(1/6-5/9)*(1/2-3/7)*71/5 3)(5/6-2/3)*(7/8-1/2)*(-4) 4)(3/8-1/6)*(2/9-2/5)*27​

Пошаговое объяснение:

1)(1/4-2/3)*(4/5-2/15)*(-3/5)=1/6

1/4-2/3=3/12-8/12=-5/12

4/5-2/15=12/15-2/15=2/3

-5/12*2/3=-5/18

-5/18*(-3/5)=1/6

2)(1/6-5/9)*(1/2-3/7)*71/5 =-71/180

1/6-5/9=3/18-10/18=-7/18

1/2-3/7=7/14-6/14=1/14

-7/18*1/14=-1/36

-1/36*71/5=-71/180

3)(5/6-2/3)*(7/8-1/2)*(-4) =-1/4

5/6-2/3=5/6-4/6=1/6

7/8-1/2=7/8-4/8=3/8

1/6*3/8=1/16

1/16*(-4)=-1/4

4)(3/8-1/6)*(2/9-2/5)*27=-1

3/8-1/6=9/24-4/24=5/24

2/9-2/5=10/45-18/45=-8/45

5/24*(-8/45)=-1/27

-1/27*27=-1