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79×5/74用简便计算..................

75乘74分之5 =(74+1)乘74分之5 =5+74分之5 =5又74分之5

简便计算:74×85 74×5递等式。 74*85-74*5 =74*(85-5) =74*80 =5920

25x5+74x5+5 =5x(25+74+1) =5x100 =500

74.5+99×74.5 =74.5×(99+1) =74.5×100 =7450

5.74×99+5.74 =5.74×(99+1) =5.74×100 =574

5.74*2.7-3.5*0.7 =17.22×(1-0.1)-2.45 =17.22-1.722-2.45 =17.22-(1.722+2.45) =17.22-4.172 =13.048

10824

解答:你好 我来帮助你解答! 原式子:126×5+5×74 (提公因式5) =5×(126+74) =5×200 =1000 祝你学习进步!!!!!1 楼主补充题目: 回答:15X(42+38)=1200元。 但愿对你帮助!!!!欢迎追问!

25*5 74*5 5 =25*5 74*5 5*1 =5*(25 74 1) =5*100 =500

计算下面各题,并用两种方法验算 100一74.5=25.5 验算: 25.5+74.5=100 或: 100-25.5=74.5

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