3*d=1(mod 40) 求d,
问题描述:
3*d=1(mod 40) 求d,
一楼麻烦说下是怎么算的
答
根据已知可以设定3d=40k+1(k为整数)
于是d=13k+(k+1)/3,d为整数,于是3|k+1,所以k=3t-1(t为整数)
所以d=13k+(k+1)/3=40t-13
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