Если 7х-3; 3х+4 и 8-х - это числители, то:
(7х-3)/9-(3x+3)/4=(8-x)/6
4(7х-3)/36 - 9(3х+3)/36 = 6(8-х)/36
4(7х-3) - 9(3х+3) = 6(8-х)
28х-12 - 27х-27 = 48-6х
7х = 87
х = 87:7
х = 12 3/7
F(x)=x²<span>+3x, x</span>₀<span>=2
</span>f(2)=2²<span>+3*2=10
</span>f⁾(x)=(x²+3x)⁾= 2х+3
f⁾(2)= 2*2+3=7
<span> y= f(x</span>₀) + f’(x₀)*(x - x₀) ⇒ у =10+7*(х-2)
f(x)=x(x-1)=х²-х<span>, k=3
</span>f⁾(x)=(x²-х<span>)= 2х-1
</span>
f⁾(x)=k
2х-1=3
2х=4
х=2 у=х²-х = 2²-2= 2
(2; 2)