计算:(1)90゜-25゜41'39" (2)36゜54'+143゜6'

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计算:(1)90゜-25゜41'39" (2)36゜54'+143゜6'
计算:(1)90゜-25゜41'39" (2)36゜54'+143゜6'

计算:(1)90゜-25゜41'39" (2)36゜54'+143゜6'
解1:
90°-25°41'39"
=89°59'60"-25°41'39"
=89°+59'+60"-(25°+41'+39")
=89°+59'+60"-25°-41'-39"
=(89°-25°)+(59'-41')+(60"-39")
=64°+18'+21"
=64°18'21"
解2:
36°54'+143°6'
=36°+54'+143°+6'
=(36°+143°)+(54'+6')
=179°+60'
=179°+1°
=180°
以上,为让楼主看清楚解题过程并了解解题思路,书写的比较啰嗦.

(1)90゜-25゜41'39"=64°18‘21“
(2)36゜54'+143゜6'=180°