这不就是个最基本的不定积分么?
P'(t) = 9(t+9)^(1/2)
所以P(t) = 6(t+9)^(3/2) + C
当前鸡肉价格为2美刀,即t=0时P(0) = 200美分,因此C = 200 - 162 = 38.
当t = 7时,P(7) = 384 + 38 = 422美分 = 4.22美刀
In a certain region,the estimate for the price of chicken is
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