12x² - 4x + 18x – 6 = 0
12х² + 14х - 6 = 0
2 (6х² + 7х -3) =0
6х² + 7х -3 =0
D=7²-4*6*(-3) = 121
x = -7 + √121 / 12 = 1/3
х = -7 - √121 / 12 = - 3/2
Ответ: х₁ = -3/2; х₂ = 1/3
Ответ: -1,8
х+у=2.6+(-4.4)= -1,8
0,2*(11,28+3,4:100*1,55):10+0,6*3 во 2степени-0,2в четвёртой степени
![\tt 0,2\cdot (11,28+3,4:100\cdot 1,55):10+0,6\cdot 3^2-0,2^4=\\1)3,4:100=0,034\\2)0,034\cdot 1,55=0,0527\\3)11,28+0,0527=11,3327\\4) 0,2\cdot 11,3327=2,26654\\5)2,26654:10=0,226654\\6)0,6\cdot 3^2=0,6\cdot 9=5,4\\7)0,2^4=0,0016\\8)0,226654+5,4-0,0016=5,625054](https://tex.z-dn.net/?f=%5Ctt+0%2C2%5Ccdot+%2811%2C28%2B3%2C4%3A100%5Ccdot+1%2C55%29%3A10%2B0%2C6%5Ccdot+3%5E2-0%2C2%5E4%3D%5C%5C1%293%2C4%3A100%3D0%2C034%5C%5C2%290%2C034%5Ccdot+1%2C55%3D0%2C0527%5C%5C3%2911%2C28%2B0%2C0527%3D11%2C3327%5C%5C4%29+0%2C2%5Ccdot+11%2C3327%3D2%2C26654%5C%5C5%292%2C26654%3A10%3D0%2C226654%5C%5C6%290%2C6%5Ccdot+3%5E2%3D0%2C6%5Ccdot+9%3D5%2C4%5C%5C7%290%2C2%5E4%3D0%2C0016%5C%5C8%290%2C226654%2B5%2C4-0%2C0016%3D5%2C625054)
Ответ:![\sf 5,625054](https://tex.z-dn.net/?f=%5Csf+5%2C625054)
Наименьший угол будет cos40. Но это не табличное значение. Примерно будет = 0,77