由方程(2)-方程(1),你有c=g。这也就是说 D*c = D*g (也就是说这块草每天生长的草可供一头牛吃。方程(3)变成不等式 D*c
由方程(2)-方程(1),你有c=g。这也就是说 D*c = D*g (也就是说这块草每天生长的草可供一头牛吃。方程(3)变成不等式 D*c
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