Ответ:

Объяснение:

1. (1, 25*2, 6-4) :1, 2+0, 3= (3, 25-4) :1, 2+0, 3=-0, 75:1, 2 + 0,3=-0, 625+0, 3=-0, 325

Или

(5/4 * 26/10 - 4) : 12/10 +3/10= (130/40 - 4) :12/10+3/10=(13/4 - 16/4) : 12/10 + 3/10= -3/4 : 12/10 + 3/10= -3/4 * 10/12 + 3/10= -30/48 + 3/10 = -10/16 + 3/10=-5/8+3/10= -25/40+12/40=-13/40

2.

25/100 + 1/12:(1/3*125/100-9/16) = 25/100+1/12:(125/300-9/16) =25/100+1/12:(5/12-9/16) =25/100+1/12:(20/48-27/48) =25/100+1/12:(-7/48) =25/100+1/12*(-48/7) =1/4-48/84=21/84-48/84=-27/84

3.

(2/9*10/8-0, 5) :(1, 6*0, 25) =(20/72-0, 5) :(16/10*1/4) =

=(5/18-1/2) :(8/5*1/4) =(5/18-9/18) :(8/20) =(-4/18) :(8/20) = -2/9 : (2/5) =-2/9*(5/2) =-10/18=-5/9