x congruent 1 mod 5x congruent 3 mod 7x congruent 4 mod 963x1 congruent 1 mod 545x2 congruent 1 mod 735x3 congruent 1 mod 9x1=2 x2=5 x3=8n=2*63*1+5*45*3+8*35*4=1921 congruent 31 mod 315所以这个数是31
31,5X6=30 14X7=28 33X9=27 4