A) 26+x*3=50 b) 480:y-19=41 c) 160/t+18=25*2 d) k/7-34=78:3 e) 9*9-540: (a-27) = 15*5 f) 80*b-3*90+430=1600:2 g) 6 1/7 - (c+2 4/7) = 2 5/7

А). 3 х = 50 - 26;

3 х = 24;

х = 24 / 3;

х = 8;

Б). 480 / y = 41 + 19;

480 / у = 60;

у = 480 / 60;

у = 8;

С). 160 / t = 50 - 18;

160 / t = 32;

t = 160 / 32;

t = 5;

Д). k / 7 = 78 / 3 + 34;

k / 7 = 26 + 34;

k / 7 = 60;

k = 60 * 7;

k = 420;

Е). 81 - 540 / (a - 27) = 75;

-540 / (а - 27) = 75 - 81;

-540 / (а - 27) = - 6;

540 / (а - 27) = 6;

а - 27 = 540 / 6;

а - 27 = 90;

а = 90 + 27;

а = 117;

f). 80 * b - 270 + 430 = 800;

80 * b = 800 + 270 - 430;

80 * b = 640;

b = 640 / 80;

b = 8;

g). - (c + 2 4/7) = 2 5/7 - 6 1/7;

- (c + 2 4/7) = - 3 3/7;

c + 2 4/7 = 3 3/7;

с = 3 3/7 - 2 4/7;

с = 6/7.