甲判返、乙两种树苗各买了x, y棵x+y=50050x+80y=28000y=100x=400甲、乙键祥两种树苗各买了400, 100棵选购甲种树苗x棵50x+80(500-x)≤稿冲搏3400080*500-30x≤34000-30x≤-6000x≥200选购甲种树苗不少于200棵
(1)甲400,乙100(2)甲200,乙300