57°49′+34°12′45〃= 40°15乘以2=(1)57°49′+34°12′45〃= (2) 40°15乘以2=

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57°49′+34°12′45〃=40°15乘以2=(1)57°49′+34°12′45〃=(2)40°15乘以2=57°49′+34°12′45〃=40°15乘以2=(1)57°49′+34°12′

57°49′+34°12′45〃= 40°15乘以2=(1)57°49′+34°12′45〃= (2) 40°15乘以2=
57°49′+34°12′45〃= 40°15乘以2=
(1)57°49′+34°12′45〃= (2) 40°15乘以2=

57°49′+34°12′45〃= 40°15乘以2=(1)57°49′+34°12′45〃= (2) 40°15乘以2=
(1).92度1分45秒 (2)80度30分

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