>
数学
>
高二数学:在三角形ABC中,已知a=2根号3,b=2根号2,c=根号6+根号2,解三角形.
人气:131 ℃ 时间:2019-10-17 04:56:57
解答
根据余弦定理,cosA=(b^2+c^2-a^2)/2bc=1/2,所以A=60度.
cosB=(a^2+c^2-b^2)/2ac=√2/2,所以B=45度.
所以C=180-60-45=75度.
推荐
0.02mm游标卡尺
怎么利用音标来背单词?
用排水法收集气体是,需用什么仪器?
南极洲的矿产资源中最丰富的是?
_______(improve)my listening ability,I listen to English programs on the radio every day.
but there are some cartoon favourites which are older 翻译,谢谢
I want to spend my life with you and I can not live sithout you!
吃鸡蛋可以喝牛奶吗
猜你喜欢
Could you buy some apples for the party?There are_______ apples at home.A.many B.much C.little D.few
警车、消防车、救护车笛声有什么不同
等差数列,a6+a7+a8=60,a3+a11=?
悯农的锄禾日当午
The flood has done _____ to this area.A.damages B.many damages C.much damage D.damaging
电场强度:E=F/Q
左边一个鱼字,右边一个儿字的繁体读什么字?
6元等于()元 ()里填两位小数
© 2024 79432.Com All Rights Reserved.
电脑版
|
手机版