1) 13x + 12x + 15 = 240
25x + 15 = 240
25x = 240 - 15
25x = 225
x = 225/25
x = 9
2) (14x - 2x)/17 = 312
12x/17 = 312
12x = 312*17
12x = 12*26*17
x = 26*17
x = 442
=(р-3)(5q+1)!!!!!!!!!!!!!!!
4(0,5g - 6) - 14g + 21 = 2g - 24 - 14g + 21 = - 12g - 3
при g = 1/3
- 12 * 1/3 - 3 = - 12/3 - 3 = - 4 - 3 = - 7
По правилам дифференцирования
(2m^4+5m^3 n-3m^2 n^2-mn^3)+(3m^4-8m^3 n^2- 6mn^3)=5m^4-11m^3n^2-7mn^3+5mn^3