Question

已知三角形ABC的周长是28cm,AB=（2x-1）cm,BC=(x+6.5)cm,AC=(2x-5)cm,求三边的长.

Answer 1

2x-1+x+6.5+2x-5=28

整理,得

5x=27.5

x=5.5

2×5.5-1=10(cm) 5.5+6.5=12(cm) 2×5.5-5=6(cm)

三角形三边长分别为10cm,12cm,6cm.