12 - 7/8 = 11 1/8
8 7/15 - 3 11/15 = 127/15 - 56/15 = 71/15 = 4 11/15
<span>Х = 16,8934 ( ≈ 16,893 )
Y = 0,01304 ( ≈ 0,013 )
XY ≈ 0,219609 ( ≈ 0,220 )
X :Y ≈ 1299,4615 ( ≈ 1299,462 )
</span>
0.3х-1.8>-7.5х-2.8
0.3х+7.5х>1.8-2.8
7.8х>-1
х>-0.13
Уравнение касательной:
y=f(x0)+f'(x0)(x-x0)
f'(x)=3x²-4x+5; f'(x0)=12; f(x0)=-12
y=-12+12(x+1)=12x