log以0.7為底0.2的對數是多少

log以0.7為底0.2的對數是多少問題補充說明:如題...如題展開

log以0.7為底0.2的對數是多少


=lg0.2÷lg0.7
=(lg2-1)認香夜許針色÷(lg7-1)
=(0.3010-1)÷(0.8451-1)
=0.6990÷0.1549
=4.5126
【log以0.7為底0.2的對數是多少】

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