3xy=2x+2y⇒y=2x/(3x-2)
7xz=3x+3z⇒z=3x/(4x-3)
5yz=6y+6z
10x/(3x-2)*3x/(4x-3)=12x/(3x-2)+18x/(4x-3)
30x²=48x²-36x+54x²-36x
72x²-72x=0
72x(x-1)=0
x=0 не удов усл
x=1
y=2/(3-2)=2
z=3/(4-3)=3
Ответ x=1;y=2;z=3
F(x) =2/x⁷ ;
f '(x) =(2x^(-7))' = 2* (-7)*x ^(-7 -1) = -14x^(-8) =-14/x⁸ .
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y = x⁴/4 ;x(0) = -1.
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α =(T^X+) - ?
tqα = y'(x(0)) ;
y' = (x⁴/4) =4x³/4 =x³ ;
y'(x(0)) = (-1)³ = -1 .
tqα = -1 ⇒ α = 135°.
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а) f(x) =(x² -3)/x ;
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f'(x(0)) = f'(2) - ?
производная дроби :
f'(x) =((x² -3)/x) = ((x² -3)' *x -(x² -3)*(x)' )/ x² =(2x² - x²+3)/x² =1+3/x².
или по другому
f(x) =x -3*x ^(-1)⇒ f'(x) = (x -3*x ^(-1))' = 1 - 3*(-1)*x ^(-1-1) = 1 + 3/x² .
f'(2) =1+ 3/2² =1,75 .
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б) f(x) =xcosx ;
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f'(x(0)) = f'(π) - ?
производная произведения :
f'(x) = (xcosx) = (x)'*cosx + x*(cosx) ' =cosx + x*(-sinx) =cosx -xsinx.
f'(π) = cosπ -πsinπ = -1 -π*0 = -1.
Думаю все .
УДАЧИ !
15a^2+13a+2=(a+0,2)(15a+10)
-3b^2+7b+6=-(b-3)(3b+2)
4k^4-17k^2+4=(2k+1)(2k-1)(k-2)(k+2)
-9t^4+10t^2-1=(3t-1)(3t+1)(t-1)(t+1)