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A.S.S.S.B.S.A.S.C.A.S.A.DA. S.S.S. B. S.A.S. C. A.S.A. D.A.A.S. 选哪一个 a =sqrt((s*(s-a)*(s-b)*(s-c)));错在哪里 a b c s× 9---------s c b a求a b c s各是多少 √s*(s-a)*(s-b)*(s-c) 请问大家这个数学公式是求什么的? ______Tom’s sister . A.He's B.His C.That’s D.This’s 2、Where’s John?.A:He’s sleeping.B:She’s sleeping.C:He’s sleep. ___hot and sunny.__no wind.A.It's...There's B.Today's...It's C.There's...It's D.It's...It's 已知三角形ABC的三条鞭分别为a,b,c求证：S三角形=sqrt(s(s-a)(s-b)(s-c)),s=(a+b+c)/2 whose name is a flower?it's-------.A.Mary's B.Jenny's C.Helen's D.Rose's what's this?A.It's here B.It's the letter S C .its S D.It's a S 应该选哪一个 [(s/a+s/b)/2]/[(s/a-s/b)/2]怎么化简[（s/a+s/b）/2]/[（s/a-s/b）/2]怎么化简 海伦公式S=√ [s(s-a)(s-b)(s-c)] 前面有个勾 代表什么意思! Where's ______?A.Tom's pants B.Tom's pen's C.Tom's pen D.pen of Tom S.A.S和U.S.M.C是什么意思? n g s s s w a 化简2s/s÷a+s÷b 选择 What's this - ( )A A.It's B.It's an C.It's a D.This is -----------wearing a raincoat?A.who's B.Where's C.what's D.Whose 怎样选择?