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79×5/74用简便计算..................

=(74+5)✘5/74 =74✘5/74+5✘5/74 =5+25/74 =5又25/74

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

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

5.74x101-5.74 =5.74x(101-1) =5.74x100 =574

5.74×9.9+57.4 =5.74×10-5.74×0.1+57.4 =57.4+57.4-0.574 =114.8-0.574 =114.226

①26×5+74×5+5 =(26+74)×5+5=500+5=505②6.74+12.62+24.38+3.26=(6.74+3.26)+(12.62+24.38)=10+37=47③0.89×4.8+5.2×0.89 =0.89×(4.8+5.2)=0.89×10=8.9④0.4×99+0.4 =0.4×(99+1)=0.4×100=40⑤34.5-(17.2+4.5)=34.5-4.5-17.2=30-17.2=12.8...

解:5.74+0.7*1.3 =5.74+(1-0.3)*1.3 =5.74+1.3-0.39 =7.04-0.39 =6.04+1-0.39 =6.04+0.61 =6.65

74×七十五分之四十四(简便计算) 74×七十五分之四十四 =44/75*(75-1) =44/75*75-44/75*1 =44-44/75 =43又31/75

原式 =5.74+5.7+0.26+4.3 =(5.74+0.26)+(5.7+4.3) =6+10 =16 供参考。

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!

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