<span>5t^2+26t-24
D = 26*26+4*24*5 = 1156 = 34^2
t1 = (-26+34)/10= 8/5 = 0.8
</span>t2 = (-26-34)/10 = -60/5 = -6
Корни 0.8 и -6
8•105-45•21+8•105•2•105=840+945+176400=179175
(6.72:3/5+9/8):1.21-51/8=3.81095
1) 6.72:3/5=6.72:0.6=11.2
2) 11.2+1.125=12.325
3) 12.325:1.21=10.18595
4) 10.18595-6.375=3.81095
Ответ: 3.81095