五年级练习题简便算法39.7*2.8+3.97*72 0.37*2400*0.25+3*8.75+2.825*30_数学解答

五年级练习题简便算法
39.7*2.8+3.97*72 0.37*2400*0.25+3*8.75+2.825*30

人气：466 ℃　时间：2020-05-08 19:26:40

解答

39.7×(2.8+7.2)=397,0.37×200×(0.25×12)+3×8.75+3×28.75=(74+8.75+28.25)×3=111×3=333