Question

余数方程,我哪里错了.I did it in this way,please inspect what's wrong

Answer 1

x≡1 (mod 28) x≡1 (mod 4) & x≡1 (mod 7)

x≡9 (mod 92) x≡1 (mod 4) & x≡9 (mod 23)

∴x≡1 (mod 28) & x≡9 (mod 92)

x≡1 (mod 4) & x≡1 (mod 7) & x≡9 (mod 23)

x≡1·(7·23)·1+1·(4·23)·1+9·(4·7)·14≡561 (mod 644)

So,the answer is [561,644]