△ABC的三边长分别为a,b,c,且都是整数,满足a≤b≤c,如果b=4,那么这样的三角形有( )个.A.8B.9C.10D.11
问题描述:
△ABC的三边长分别为a,b,c,且都是整数,满足a≤b≤c,如果b=4,那么这样的三角形有( )个.
A.8
B.9
C.10
D.11
答
C、10个
答
C.10 吧!
答
选C
(a,c)=(1,4)(2,4)(3,4)(4,4)(2,5)(3,5)(4,5)(4,6)(3,6)(4,7)