<span>x²+2xy+4y² /x³-8y³ = (х+2у)</span>² / (х-2у)(х²+2ху +4у²) = (х+2у)² / (х-2у) =
= (3/8 + 22/16)² / (3/8 - 22/16) = (6/16 + 22/16)² / (6/16 - 22/16) =
= (28/16)² /(-16/16) = (7/4)² /(-1) = - 49 /16 = -3 целых 1/16
1. 4√x+24√x-25√x=√x(4+24-25)=3√x
2. 3*0.3√y-0.6*12√y+18/11*11/6√y=√y(0.9-7.2+3)=-3.3√y
Х-скорость течения
4*(15+х)=60
15+х=60:4
15+х=15
х=0км/ч