x除以tan30°减x除以tan45°＝14
x tan60 - x tan45 = 14
(根号3- 1 ) x = 14
x = 14 (根号3+ 1 ) / 2
= 7(根号3+ 1 )
= 7根号3+ 7除以tan30°减x除以tan45°＝14x tan60 -x tan45 = 14tan30°为什么变成了tan60°1/ tan30=tan60