15x+3y+1.5z+0.4(100-x-y-z)=100 整理得:146x+26y+11z=600奇偶分析得到:z一定是偶数。按x的大小试数:得:x=4,26y+11z=16,不可能。x=3,26y+11z=162,y=6+3/13-11z/26。z=10,y=2,100-x-y-z=85x=2,26y+11z=308,y=11+11/13-11z/26.z=2,y=11,100-x-y-z=85.(z=28,y=0也是一个解)x=1,26y+11z=454,y=17+6/13-11z/26,z=20,y=9,100-x-y-z=70因此,若每种动物都有,共三种可能:猪3,兔2,鸡10,鸟85
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