1/5+7/15+4/15 =3/15+7/15+4/15 =14/15 7/10-(3/4-2/5)=1-27/99+55/99 =1+28/99 =1又28/99 请在4天内发给我!..
用简便方法计算.30*(3/10+7/15),2又1/2*4/15+1/3*5/2+2/5*5/2,4/5*3/8*5/
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