0.6x^2 + 0.8x - 7.8 = 0 / * 10
6x^2 + 8x - 78 = 0
D = 64 + 4*6*78 = 1936 = 44^2
x1 = ( - 8 + 44)/12 = 36/12 = 3
x2 = ( - 8 - 44)/12 = - 52/12 = - 13/3
0,5*10-³=5*10-⁴. Тогда 5*10-⁴< 5,3*10-⁴ и 0,5*10-³< <span>5,3*10-⁴.</span>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~