Лист 2-ой№1 №25х - 5,5 = 7х - 6х + 4,5 6х - 3,2 = 5х - 6 + 4,5х5х - 7х + 6х = 5,5 + 4,5 6х - 5х - 4,5х = - 6 + 3,24х = 10 - 3,5х = - 2,8
х = 2,5 х = 0,8№3 №4Х/5 - (х -4)/3 = 2 Общ.знам.15 (х+4)/6 -х/9 = -1 Общ.знамен.=183х - 5х + 20 = 30 3х + 12 - 2х = - 18- 2х = 30 - 20 х = - 18 - 122х = - 10
х = - 30х = - 5-----------------------------------------------------------------------------------------------------------------------------------
Лист 1-ый№5(0,5х + 3) (0,2х - 1) = 00,1х^2 - 0,5x + 0,6x - 3 = 00,1x^2 + 0,1x -3 =0 сократим на 0,1х^2 + x - 30 = 0D = 1 -4(-30) = 1 + 120 = 121; YD = 11
x1 = (-1 +11) / 2 = 5x2 = (-1 -11) / 2 = -6№7 №8 №9 №10х (х + 5) = 0 х (2х -7) = 0 7х^2 = 28 3х^2 = 27
х1 = 0 х1 = 0 x^2 = 4 x^2 = 9
х2 = - 5 2х - 7 = 0
x1 = 2 x1 = 3 2х = 7
x2 = - 2 x2 = - 3 х2 = 3,5