小数的四则混合运算以及简便计算.ppt

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1、简便计算脑筋转转转0.5×0.20.25×0.41.25×0.80.025×40.125×0.41.25×1.60.125×0.80.25×0.125×0.4×80.125×0.4×0.20.3×0.25＋0.25×0.11.25＋0.80.4＋0.250.8－0.1258.4－0.360.5×0.2×2.40.25×0.73×40.25×1.21.25×8×2.50.25×（7.3＋7.3＋7.3＋7.3）简便计算0.32×4031.25×32×2.50.85×199101×0.853.6－3.6×0.925×（1.2

2、5＋4）×0.8简便计算7.6×0.8+0.2×7.67.6×0.8+2×0.763.12×99＋3.123.12×9.9＋0.312简便计算⑴1.25×(8＋0.08)⑵1.25×(8－0.08)⑶2.56×3.4＋2.56×6.6⑷25.1×503－25.1×303简便计算⑸3.81×2.8＋3.81×6.2＋3.81⑹0.75×65＋0.75＋36×0.75⑺0.75×65＋3÷4＋36×0.750.64×5.7+6.4×0.437.24×1.36+72.4×0.1363.6×2×8.2+7.2×1.80.8×0.

3、4×5.6+0.16×2×4.4简便计算⒀3.54×89＋35.4×1.1⒁12.3×8.5＋36.9×0.5⒂1.25×87×5.3＋1.25×87×2.7⒃12.5×2.9×0.25＋0.3×0.25×12.5简便计算(超级变变变)⑻3.2×99⑼3.2×99＋3.2⑽3.2×99＋3.3⑾3.2×99＋3.1⑿3.2×98＋6.4简便计算⒄111×1.25×96－888×1.25×11⒅3.6×0.4＋1.2×0.6＋0.3×4.8⑴9982+2008⑵20032－2003－2004－2005简便计算⑶15＋16＋

4、17＋18＋19＋20＋21＋22＋23⑷93＋95＋97＋99＋101＋103＋105＋107⑸1997－118－120－122－124－126－128－130－132简便计算⑺321×89－112×121＋23×321⑻35×48－26×87＋48×52－87×123.4×9.91.8×10.24.3×9823.8×5.6+23.8×5.4-23.80.25×12.5×3.23.68×1.6×0.1251.2×34+12×5.2+0.12×1403.65×2.5×0.41.8×98+3.61.3×99+1.31.25

5、×(8+0.8)0.25×4.41.25×8.812.5×2.5×(4+0.8)2.6×8.4+26×0.160.46×0.62+4.6×0.0381.35×5.3+1.35×4.7+1.35