14又3∕4*28-14又3∕4*8

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14又3∕4*28-14又3∕4*8

方法一:(14又3∕4)*28-(14又3∕4)*8
=(14又3∕4)*(28-8)
=(14+3∕4)*20
=14*20+3/4*20
=280+15
=295
方法二:(14又3∕4)*28-(14又3∕4)*8
=(14又3∕4)*(28-8)
=(14+3∕4)*20
=(56/4+3/4)*20
=59/4*20
=59*5
=295

(14又3∕4)*28-(14又3∕4)*8
=(14又3∕4)*(28-8)
=(14又3∕4)*20
=14*20+3/4*20
=280+15
=295