stelny 寫到:25=32(mod7)=4(mod7)
210=42(mod7)=16(mod7)=2(mod7)
240=24(mod7)=16(mod7)=2(mod7)
33=27(mod7)=6(mod7)
36=62(mod7)=36(mod7)=1(mod7)
330=15(mod7)=1(mod7)
240*330=2*1(mod7)=2(mod7)
所以240*330除以7餘2
好漂亮的做法
妳係 stenly ???? Kenny ????
stelny 寫到:25=32(mod7)=4(mod7)
210=42(mod7)=16(mod7)=2(mod7)
240=24(mod7)=16(mod7)=2(mod7)
33=27(mod7)=6(mod7)
36=62(mod7)=36(mod7)=1(mod7)
330=15(mod7)=1(mod7)
240*330=2*1(mod7)=2(mod7)
所以240*330除以7餘2