X+Y=5000 X-400=(Y+400)*2+400
问题描述:
X+Y=5000 X-400=(Y+400)*2+400
答
X-400=(Y+400)*2+400
X-400=2Y+800+400
X-2Y=1600 (1)
X+Y=5000 (2)
(2)-(1)
3Y=3400
Y=3400/3
X=5000-Y=11600/3