∠A = 180° - ∠B - ∠C = 75°,在三角形中：
a / sinA = b / sinB
∴b = a sinB / sinA = 10 * sin60° / sin75°
= 10 * sin60° / (sin45°cos30° + sin30°cos45°)
=15*(根号2) -5*(根号6)
证明题：在三角形ABC中,a=10,B=60度,C=45度,则b的值为?
证明题：在三角形ABC中,a=10,B=60度,C=45度,则b的值为?
数学人气：770 ℃时间：2020-03-18 07:13:57
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