Объяснение:
S₁=6t2+2
V₁=S₁'=12t
S₂=2t3+2t2+2t
V₂=S₂'=6t²+4t+2
V₁=V₂
12t=6t²+4t+2
6t²+4t+2-12t=0
6t²-8t+2=0
3t²-4t+1=0
t₁₋₂=(4±√(16-12))/6=(4±2)/6={(1/3);1}
t₁=1/3 (c) ; t₂=1 (c)
Объяснение:
S₁=6t2+2
V₁=S₁'=12t
S₂=2t3+2t2+2t
V₂=S₂'=6t²+4t+2
V₁=V₂
12t=6t²+4t+2
6t²+4t+2-12t=0
6t²-8t+2=0
3t²-4t+1=0
t₁₋₂=(4±√(16-12))/6=(4±2)/6={(1/3);1}
t₁=1/3 (c) ; t₂=1 (c)