求3.14×78＋0.314×0.78＋314×0.22＋31.4的简便算法,_数学解答

求3.14×78＋0.314×0.78＋314×0.22＋31.4的简便算法,

人气：219 ℃　时间：2020-02-05 11:20:51

解答

3.14×78＋0.314×0.78＋314×0.22＋31.4 =3.14*78+3.14*0.078+3.14*22+3.14*10 =(78+0.078+22+10)3.14=345.64492