1) √(100*0,49) - (1/3)√36 = √49 - √4 = 7-2 = 5
2) √16*√0,25+√5³-4 = 4*0,5 + √121 = 2+11 = 13
3) 3*0,9- 15 = 2,7-1,5 = 1,2
4) (8/3)+ (7/4) - 12 = (8/3 + 7/4) - 12 = (32-21/12)-12 = (11/12)- 12 = 11-144/12 ≈ -11,1
5) 11-1,2 = 9,8
6) 4*13 - 25*8 = 52- 200 = -158
7) 14 * (15/49) - 3 = 210/49 - 3 = 63/49 ≈ 1,29
8) 23 - 21 = 2
1) 6х-3=4
6х= 7
х= 7/6
последнее не знаю :(