英语翻译the accumulation function is A（t）=8*t^2 + 2t +100find th

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英语翻译
the accumulation function is A（t）=8*t^2 + 2t +100
find the present value of 1 to be paid at time t=1.25 evaluated at time t=0.75
A(0.75)/A（1.25） = 0.922

《红利论》的基本问题;
聚积函数为：A（t）=8*t^2 + 2t +100
找出：在时间t = 1.25和在时间t = 0.75内的支付现值评估（率）.
A(0.75)/A（1.25）=（8*0.75²+2*0.75+100 ）/（8*1.25²+2*1.25+100）=106/115 = 0.92174~=0.922
再问：支付现值评估时什么啊有定义吗我在书里没看见过啊为什么是两个积累值相除啊

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