第3讲 小数除法简便计算

《第3讲 小数除法简便计算》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、姓名：_______________小数乘除法简便计算一、除法的性质：___________________________________________________________________如：a÷b÷c=a÷（b×c）a÷b÷c=a÷c÷b【例1】1.28÷0.25÷4【拓展练习】320÷2.5÷49500÷1.25÷803.9÷（1.3×2）【牛刀小试】94×16÷94503÷26×2609.4×26÷0.9450.3÷0.26×26【例2】50.3÷0.26×9.4×26÷0.94【强化训练】3.27÷46.8×5.

2、59÷32.7×4.68÷55.9二、【商不变的规律】_____________________________________________________________________【例3】12÷0.125【强化训练】90÷5÷656÷3518÷25【例4】（8.8×3.2×9.6）÷（1.6×4.4×3.2）【拓展练习】（9.1×4.8×7.5）÷（2.5×1.3×1.6）【例5】7.2÷2.4+9.6÷2.41.1÷2+2.2÷4+3.3÷6【拓展练习】1.7÷0.8+1.9÷0.8+2.1÷0.8+2.3÷0.83.5÷

3、0.6+4.5÷0.6+6.7÷0.6+3.3÷0.6思考题0.625×0.625×…×0.625×8×8×…×8×0.2×0.2×…×0.22005个2005个2005个【大胆闯关】7272.72÷0.9÷0.89÷0.125÷87200÷12.5÷3642÷3.55.9÷17×4.3×1.7÷0.431.35×3.5＋13.5×0.6592×0.59+0.41×1.59-0.333×5.9家作巩固1、简便计算7.8÷（7.8×2）1.25×7.48×806.72÷2.5÷0.42.45×0.34－0.45×0.344.17×0.62

4、+0.38×4.178.1÷542、简便计算0.25×5.6×0.48.8×1.257.2×10.27.2×9.9+0.727.28÷1.25÷0.80.45÷0.6÷0.55.6÷3.54.5÷1.80.7777×0.7+0.1111×2.1