(2.15﹢5.17＋3.62)×(5.17＋2.15＋8.5)－(3.62＋2.15＋8.5＋5.17)×(2.15＋5.17)_数学解答

(2.15﹢5.17＋3.62)×(5.17＋2.15＋8.5)－(3.62＋2.15＋8.5＋5.17)×(2.15＋5.17)用简便方法计算

人气：110 ℃　时间：2020-03-30 02:33:05

解答

原式=[(2.15+5.17)＋3.62]×[(2.15+5.17)＋8.5]－[3.62＋8.5＋(2.15+5.17)]×(2.15+5.17)=(2.15+5.17)²+3.62×(2.15+5.17)+8.5×(2.15+5.17)+3.62×8.5-[3.62×(2.15+5.17)+8.5×(2.15+5.17)+(2.15+5.17)²...