<span>(a-b)(a+3)-(a+b)(a-3)+2ab=а^2+3a-ba-3b-a^2+3a-ba+3b+2ab=6a-2ba+2ab=6a</span>
F(x)=4x^8-3/√x
(3x^(-1/2))'=-3*1/2*x^(-3/2)=-3/2√(x)³
f'(x)=32x^7+1.5/√(x)³
Х^2=30-х
х^2+х-30=0
д=1+120=121
х1=-1-11/2=-6
х2=-1+11/2=5
<span>
(b²+2b+1)/(b²+8b+7)
</span><span>b²+2b+1=(b+1)²
</span>b²+8b+7= <span>b²+7b+b+7=b(b+7)+(b+7)=(b+7)(b+1)</span>
(b²+2b+1)/(b²+8b+7) = <span>(b+1)²/</span><span>(b+7)(b+1) = </span>(b+1)/<span>(b+7)</span>