=3.14*(7.8+2*1.1)(7.8-2*1.1) =3.14*10*5.6 =175.84 *撒意思
人气：240 ℃ 时间：2020-06-20 14:31:25
解答
乘的意思你确定？确定，电脑上打的话都用这样打
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