print("輸入Y型的R1、R2、R3:")

r1 = eval(input())

r2 = eval(input())

r3 = eval(input())

ra = (r1*r2+r2*r3+r3*r1)/r2

rb = (r1*r2+r2*r3+r3*r1)/r3

rc = (r1*r2+r2*r3+r3*r1)/r1

print("RA、RB、RC的值：",ra,rb,rc)

print("輸入RA、RB、RC:")

ra = eval(input())

rb = eval(input())

rc = eval(input())

r1 = (ra*rb)/(ra+rb+rc)

r2 = (rb*rc)/(ra+rb+rc)

r3 = (ra*rc)/(ra+rb+rc)

print("R1、R2、R3的值：",r1,r2,r3)