7/4 : 375/100=4х:15
7/4*100/375=4х: 15
700/1500=4х:15
7/15=4х:15
4х= 7/15*15
4х=7
х=7/4= 1 3/4
Ответ х= 1 3/4
6 2/3:(5 2/9-у)=4 4/9
2*2:(10/9у)=16/9
2*2/(10/9 у)=16/9
4*9 /10у=16/9
18/5у = 16/9
162=80у
у=81/40
у=(примерно)2.02
1) f'(x) = -3x² + 5x -6eˣ
2) f'(x) = 49/3 * x⁶ * Sinx + 7/3*x⁷ * Cosx
3) f(x) = 4Cos²x/Sinx
f'(x) = (-8Cosx*Sinx *Sinx - 4Cos²x*Cosx)/Sin²x = (-8Cosx*Sin²x - 4Cos³x)/Sin²x
4) f'(x) = 14*3¹⁴ˣ⁻⁹ * ln3
5) f'(x) = -39/4x⁻¹⁴- 1/(2√x) - 2
1) 7, 28.2) нет. 3) 777, 84,210, 49, 35,