Katta shahardan chiqish yo'lida soat 2 dan 6 gacha bo'lgan vaqt oralig'idagi mashinalarning tezligi quyidagicha berilgan: v ((t) = t3 -15t2 +72t +8 t ∈ [2,6] uchun a) eng tez harakatlanuvchi mashinalar qaysi vaqtda harakatlanadi? Javobni tushuntiring. b) eng past harakatlanuvchi mashinalar qaysi vaqtda harakatlanadi? Javobni tushuntiring.
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