17.2X1/4+2.8X1/4+1.7X1/4+2.3X1/4
=(17.2 +2.8 +1.7+2.3)×(1/4)
=(20+4)×(1/4)
=24×(1/4)
=6
所以可知17.2X1/4+2.8X1/4+1.7X1/4+2.3X1/4能被6整除,不能被8整除.
17.2X1/4+2.8X1/4+1.7X1/4+2.3X1/4
=(17.2 +2.8 +1.7+2.3)×(1/4)
=(20+4)×(1/4)
=24×(1/4)
=6
所以可知17.2X1/4+2.8X1/4+1.7X1/4+2.3X1/4能被6整除,不能被8整除.