在Rt△ABC中∠A = 90°,AB=3,AC=4
∴BC = 5
∵BP = x
∴PC = 5-x
∵DP//AB
∴DP/AB = PC/CB
DP = PC * AB / CB = (15-3x)/5
∵EP//AC
∴EP/AC = BP/BC
EP = BP * AC / BC = 4x/5
∴PD + EP = (15+x)/5
在Rt△ABC中∠A = 90°,AB=3,AC=4
∴BC = 5
∵BP = x
∴PC = 5-x
∵DP//AB
∴DP/AB = PC/CB
DP = PC * AB / CB = (15-3x)/5
∵EP//AC
∴EP/AC = BP/BC
EP = BP * AC / BC = 4x/5
∴PD + EP = (15+x)/5