Сначала упростим выражение, а затем подставим
![a=- \frac{2}{7}](https://tex.z-dn.net/?f=a%3D-+%5Cfrac%7B2%7D%7B7%7D+)
![(2a-3b)3b+(a-3b)^{2} = \\ =6ab-9 b^{2} + a^{2} -6ab+ 9b^{2} = \\ = a^{2} \\ \\ a^{2} = (- \frac{2}{7} )^{2} = \frac{4}{49}](https://tex.z-dn.net/?f=%282a-3b%293b%2B%28a-3b%29%5E%7B2%7D+%3D+%5C%5C+%0A%3D6ab-9+b%5E%7B2%7D+%2B+a%5E%7B2%7D+-6ab%2B+9b%5E%7B2%7D+%3D+%5C%5C+%0A%3D+a%5E%7B2%7D++%5C%5C++%5C%5C+a%5E%7B2%7D+%3D+%28-+%5Cfrac%7B2%7D%7B7%7D+%29%5E%7B2%7D+%3D+%5Cfrac%7B4%7D%7B49%7D+)
5^18-25^8=5^18-(5^2)^8=5^18-5^16=5^16*(5^2-1)=5^16*24=5^15*5*24=5^15*120- кратно 120
3x-2y+4=0
2y=3x+4 |:2
y=3/2 x +2
y=kx +m
k=3/2
Ответ: 2) 3/2
(2x)²+(2(x+1))²=10²
4x²+4(x²+2x+1)=100
<span>4x²+4x²+8x+4-100=0
</span>8x²+8x-96=0
x²+x-12=0
x₁=-4 посторонний корень x₂=3 - v₁
v₂=4 km