1)есть формула для
![x1 {}^{2} + x2 {}^{2} = \frac{ {b }^{2} + 2ac}{ {a}^{2} }](https://tex.z-dn.net/?f=x1+%7B%7D%5E%7B2%7D++%2B+x2+%7B%7D%5E%7B2%7D++%3D+++%5Cfrac%7B+%7Bb+%7D%5E%7B2%7D++%2B+2ac%7D%7B+%7Ba%7D%5E%7B2%7D+%7D++)
сам вычислиш
2)
![\frac{ {x2}^{2} + {x1}^{2} }{x1 \times x2}](https://tex.z-dn.net/?f=+%5Cfrac%7B+%7Bx2%7D%5E%7B2%7D+%2B++%7Bx1%7D%5E%7B2%7D++%7D%7Bx1+%5Ctimes+x2%7D+)
а х1×х2 это
![\frac{c}{a}](https://tex.z-dn.net/?f=+%5Cfrac%7Bc%7D%7Ba%7D+)
3)по Виету найдешь корни и подставиш
4)это также
Ответ
в а ровно 3 а в 14 в числителе в знаменателе b в 7
б ровно в счис а-в знам 6
в ровно 1 в числ 10х в знамъ
Объяснение:
Если я все правильно поняла,то:
(6,2ав²-3а)+(в-7,2в²а)= 6,2ав²-3а+в-7,2в²а= 3,2в²+в-7,2в²а=10,4в(5 степени)а
1)![(x+4)^{2}=4x^{2}+5](https://tex.z-dn.net/?f=%28x%2B4%29%5E%7B2%7D%3D4x%5E%7B2%7D%2B5+)
<var />![x^{2}+8x+16=4x^{2}+5](https://tex.z-dn.net/?f=+x%5E%7B2%7D%2B8x%2B16%3D4x%5E%7B2%7D%2B5+)
<var />![-3x^{2}+8x+11=0](https://tex.z-dn.net/?f=+-3x%5E%7B2%7D%2B8x%2B11%3D0+)
<var> D=64+132=196 </var>
![x_{1}=\frac{8+\sqrt{196}}{6}=\frac{22}{6}=3\frac{4}{6}=3\frac{2}{3}](https://tex.z-dn.net/?f=+x_%7B1%7D%3D%5Cfrac%7B8%2B%5Csqrt%7B196%7D%7D%7B6%7D%3D%5Cfrac%7B22%7D%7B6%7D%3D3%5Cfrac%7B4%7D%7B6%7D%3D3%5Cfrac%7B2%7D%7B3%7D+)
<var />![x_{2}=\frac{8-\sqrt{196}}{6}=\frac{-6}{6}=-1](https://tex.z-dn.net/?f=+x_%7B2%7D%3D%5Cfrac%7B8-%5Csqrt%7B196%7D%7D%7B6%7D%3D%5Cfrac%7B-6%7D%7B6%7D%3D-1)
2)![9x(4x-1)=3x-1](https://tex.z-dn.net/?f=9x%284x-1%29%3D3x-1+)
<var />
<var />
<var>D=144-144=0 </var>
![x_{1}=\frac{12}{2*36}=\frac{12}{72}=\frac{1}{6}](https://tex.z-dn.net/?f=+x_%7B1%7D%3D%5Cfrac%7B12%7D%7B2%2A36%7D%3D%5Cfrac%7B12%7D%7B72%7D%3D%5Cfrac%7B1%7D%7B6%7D+)
3)![0,09-4x^{2}=1,6x](https://tex.z-dn.net/?f=0%2C09-4x%5E%7B2%7D%3D1%2C6x+)
<var />![-4x^{2}-1,6x+0,09=0](https://tex.z-dn.net/?f=+-4x%5E%7B2%7D-1%2C6x%2B0%2C09%3D0+)
<var> D=2,56+1,44=4</var>
<var />![x_{1}=\frac{1,6+\sqrt{4}}{-8}=\frac{3,6}{-8}=-0,45](https://tex.z-dn.net/?f=+x_%7B1%7D%3D%5Cfrac%7B1%2C6%2B%5Csqrt%7B4%7D%7D%7B-8%7D%3D%5Cfrac%7B3%2C6%7D%7B-8%7D%3D-0%2C45+)
<var />![x_{2}=\frac{1,6-\sqrt{4}}{-8}=\frac{-0,4}{-8}=0,05](https://tex.z-dn.net/?f=+x_%7B2%7D%3D%5Cfrac%7B1%2C6-%5Csqrt%7B4%7D%7D%7B-8%7D%3D%5Cfrac%7B-0%2C4%7D%7B-8%7D%3D0%2C05)
4)
<var />
<var />
<var>D=0,16+5,6=5,76 </var>
<var />![x_{2}=\frac{-0,4+\sqrt{5,76}}{0,2}=\frac{-0,4+2,4}{0,2}=\frac{2}{0,2}=10](https://tex.z-dn.net/?f=+x_%7B2%7D%3D%5Cfrac%7B-0%2C4%2B%5Csqrt%7B5%2C76%7D%7D%7B0%2C2%7D%3D%5Cfrac%7B-0%2C4%2B2%2C4%7D%7B0%2C2%7D%3D%5Cfrac%7B2%7D%7B0%2C2%7D%3D10)
5) ![(x-4)(4x-3)+3=0](https://tex.z-dn.net/?f=%28x-4%29%284x-3%29%2B3%3D0++)
![4x^{2}-16x-3x+12+3=0](https://tex.z-dn.net/?f=+4x%5E%7B2%7D-16x-3x%2B12%2B3%3D0++)
![4x^{2}-19x+15=0](https://tex.z-dn.net/?f=+4x%5E%7B2%7D-19x%2B15%3D0+)
<var> D=361-240=121 </var>
![x_{1}=\frac{19+\sqrt{121}}{8}=\frac{30}{8}=\frac{15}{4}=3\frac{3}{4}](https://tex.z-dn.net/?f=+x_%7B1%7D%3D%5Cfrac%7B19%2B%5Csqrt%7B121%7D%7D%7B8%7D%3D%5Cfrac%7B30%7D%7B8%7D%3D%5Cfrac%7B15%7D%7B4%7D%3D3%5Cfrac%7B3%7D%7B4%7D++)
![x_{2}=\frac{19-\sqrt{121}}{8}=\frac{8}{8}=1](https://tex.z-dn.net/?f=+%C2%A0x_%7B2%7D%3D%5Cfrac%7B19-%5Csqrt%7B121%7D%7D%7B8%7D%3D%5Cfrac%7B8%7D%7B8%7D%3D1)
6)![(x+5)^{2}+(x-2)^{2}+(x-7)(x+7)=11x+80](https://tex.z-dn.net/?f=%28x%2B5%29%5E%7B2%7D%2B%28x-2%29%5E%7B2%7D%2B%28x-7%29%28x%2B7%29%3D11x%2B80+)
<var />
<var />
<var>D=25+1200=1225 </var>
<var />
![x_{2}=\frac{5-\sqrt{1225}}{6}=\frac{-30}{6}=-6](https://tex.z-dn.net/?f=+x_%7B2%7D%3D%5Cfrac%7B5-%5Csqrt%7B1225%7D%7D%7B6%7D%3D%5Cfrac%7B-30%7D%7B6%7D%3D-6)
Log(1/6) 36=log(1/6) (1/6)^(-2)=-2
log(27) 81=log(3^3) 3^4=4/3
log(2) x=log(2) 4+log(2) c^2+log(2) (a+b-log(2) (b^3)
log(2) x=2+2logc+log(a+b) -3logb (основание 2!)