把得分相加，就会得出最高4分最低- 4分的父亲投入指数。
The scores were combined to create a paternal-investment index which ranged from a high of + 4 to a low of -4.
ITU将固定电话、移动电话和固网宽带互联网服务的平均成本相加，计算其在人均国民总收入中所占比例，得出ict价格指数。
The ITU's ICT price basket combines the average cost of fixed-line telephones, mobile phones and fixed-line broadband Internet services, calculated as a proportion of gross national income per person.
发明对数是为了简化繁琐的计算，因为用幂指数的相加或相减可以等同于它们的基数的相乘或相除。
Logarithms were invented to simplify cumbersome calculations, since exponents can be added or subtracted to multiply or divide their bases.
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