a b c s× 9---------s c b a求a b c s各是多少

a b c s× 9---------s c b a求a b c s各是多少 a b c s 乘 9 -----------s c b a 怎么算 s= c= b= a= 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 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 下面竖式中a、b、c、s各代表什么数字.A b c s× 9s c b A最好能告诉原因. a b c s× 9___________s c b aa/b/c/s各代表什么?直接告诉我就好了 √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. whose name is a flower?it's-------.A.Mary's B.Jenny's C.Helen's D.Rose's ___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 How is your friend,Tom?下一句是什么A.He's a student B.He's OK C.He's 9 D.He's a good girl 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 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 -----------wearing a raincoat?A.who's B.Where's C.what's D.Whose 怎样选择? What's this( )a photo?A.It's B.it's C.Its