(S-1)/3>a+2 s>3a+7=3*4+7=19
14-S>1-2a 13+2a>s 13+2*4=21>s
(3a-2)/2=(4a-1)/3 a=4
21>s>19 S是整数20
斜边=s/a*2=20/4*2=10
斜边上中线CM=1/2*斜边=5
(S-1)/3>a+2 s>3a+7=3*4+7=19
14-S>1-2a 13+2a>s 13+2*4=21>s
(3a-2)/2=(4a-1)/3 a=4
21>s>19 S是整数20
斜边=s/a*2=20/4*2=10
斜边上中线CM=1/2*斜边=5