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七年级数学难题，知x，y，z满足 W=3x+4y+5z，求W最大值与最小值
七年级数学难题，已知非负实数x，y，z满足（x-1）/2+（2-y）/3=（z-3）/4，设 W=3x+4y+5z，求W的最大值与最小值
人教版七年级数学，最常考考易错重要知识点、竞赛、综合压轴题153/284
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