1 спосіб:
3х+2/х+1
6х+1/х+1
2 спосіб:
-3х-2/х-1
-6х-1/-х-х
8 - 14х + 6 = 6 -9х
- 14х + 9х = 6 - 6 - 8
- 5х = -8
х = 1,6
<span>f(x)=-x^2+3x-1
f(-1)=-(-1)</span>²+3(-1)-1=-1-3-1=-5
Х^2+4ху-5у^2=(х^2+2*х^2*2у+4у^2)-9у^2=(х+2у)^2-(3у)^2=(х+2у-3у)(х+2у+3у) =(х-у) (х+5у)