wangdawei2008
幼苗
共回答了24个问题采纳率:95.8% 举报
设从A,B,C中分别取x,y,z千克:
A取x,4:3:2,好米占4x/(4+3+2)=4x/9,中米占3x/9,次米占2x/9,
B取y,3:1:5,好米占3x/(3+1+5)=3y/9,中米占y/9,次米占5y/9,
C取z,2:6:1,好米占2z/9,中米占6z/9,次米占z/9,
4x/9+3y/9+2z/9=210/3
3x/9+y/9+6z/9=210/3
2x/9+5y/9+z/9=210/3
解方程组即可.
1年前
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