1. ax to the power of n plus b
2. n root of ax to the power of n minus 1
3. the sum of a and b times c, all devided by d, minus 1 then
a b c d are contants.
系数 coefficient
n次方 to the power of n
n次根 n root of
常数 constant
和 sum
差 difference
积 product
商 quotient
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