<span>х/2+х/3=4
3x/6+2x/6=4
5x=24
x=24/5</span>
(Х-7)^2-2х(Х+2)=х^2-14х+49-2х^2-4х=-х^2-18х+49
10*1,04^4~11,7 г.................................
(7a-12b)(7a+12b)-49a^2=49a^2-144b^2-49a^2=-144b^2=-144(0.1)^2=-144×0,01=-1,44
Как я понимаю из условия F(x) - это первообразная f(x)
Надо взять производную от первообразной
![f(x) = F'(x) = \frac{-3}{8}*\frac{4}{3}(-Sin\frac{4x}{3})+\frac{3}{4}*\frac{2}{3}(-Sin\frac{2x}{3})](https://tex.z-dn.net/?f=f%28x%29+%3D+F%27%28x%29+%3D+%5Cfrac%7B-3%7D%7B8%7D%2A%5Cfrac%7B4%7D%7B3%7D%28-Sin%5Cfrac%7B4x%7D%7B3%7D%29%2B%5Cfrac%7B3%7D%7B4%7D%2A%5Cfrac%7B2%7D%7B3%7D%28-Sin%5Cfrac%7B2x%7D%7B3%7D%29)
![f(x)=F'(x)=\frac{1}{2}Sin\frac{4x}{3}-\frac{1}{2}Sin\frac{2x}{3}=\frac{1}{2}Sin\frac{2x}{3}(2Cos\frac{2x}{3}-1)](https://tex.z-dn.net/?f=f%28x%29%3DF%27%28x%29%3D%5Cfrac%7B1%7D%7B2%7DSin%5Cfrac%7B4x%7D%7B3%7D-%5Cfrac%7B1%7D%7B2%7DSin%5Cfrac%7B2x%7D%7B3%7D%3D%5Cfrac%7B1%7D%7B2%7DSin%5Cfrac%7B2x%7D%7B3%7D%282Cos%5Cfrac%7B2x%7D%7B3%7D-1%29)