原式=(179°59'60"-91°32′24″)÷2=88°17'36"÷2=88°16'96"÷2=44°8'48"
原式=(179°59'60"-91°32′24″)÷2=（88°27'36"）÷2=（88°26'96"）÷2=44°13'48"（上面那个被推荐的算错了）C式工作室为您解答
