Question

Помогите пж.. Срочно.

Answer 1

1) 5*1/5 - 7*2/21 = 1 - 2/3 = 1/3

2) 12x - (3x - 5) + (9x - 3) = 12x - 3x + 5 + 9x - 3 = 18x + 2

3) 4(x+0,2) = 5x - 3,8;  x = 4,6

4) -4(5x-0,1) + 18x + 2 = -2x+2,4; -2(-0,3)+2,4=0,6+2,4=3

c1) 0,4*6-3  и  -0,4*6-3

-0,6 > -5,4

c2)  S = 85t + 90t = 175t;