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页数:10页
时间:2020-04-25
《小数的简便计算复习课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、小数的简便计算苏教版小学数学第九册复习执教:姚旭瑾直接说出得数0.98×0.1=1-0.99=1.25×0.8=0.6÷0.01=6.37+4.63=4.9÷7=0.24×5=0.1-0.01=8÷0.125=0.098601.20.01116410.70.09×812.5×6.7+12.5×3.3=12.5×(6.7+3.3)=12.5×10=1252.5×6.8×0.0415-2.68-7.323.5×2.7-3.5×0.74.35+0.17+0.65+0.8535÷(0.35×4)(2.5+0.25)×4×13.78×9
2、9+3.785.6×101-5.6×12.5×12.5×0.32102×0.873.5÷1.42.6×9.9(0.4×0.8)(100+2)(0.7×2)(10-0.1)5.23×4+4.77÷0.2563.2×0.1+6.32×94.77×463.2×0.96.32×130.34+9.76-10.345.12-(3×0.04+3.3)=5.12-(0.12+3.3)利用策略可以简便计算利用规律进行简便简算0.3×0.3=0.090.33×0.33=0.10890.333×0.333=0.1108890.3333×0.3333
3、=0.33333×0.33333=0.111088890.1111088889易错题辨析8.45+3.67-8.45+3.674.3×0.1÷4.3×0.12+8÷0.441-7.7+2.3
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