影儿 | 发布日期:2014-01-08 05:18:26
Assume that a,b,c,d are all integers,and four equations (a-2b)x=1,(b-3c)y=1,(c-4d)z=1,w+100=d have always solutions x,y,z,w of positive numbers respectively,then the minimum of a is ____________. (英汉词典:to assume 假设;integer 整数;equation 方程;solution(方程的)解;positive 正的;respectively 分别地;minimum 最小值) |