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怎么算简便就怎么算.0.25×9.87×4      &nb

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/21 10:40:16
怎么算简便就怎么算.
0.25×9.87×4                           
9.9×5.6
8.45-3.14-1.86                       
76.3×27-76.3×17.
(1)0.25×9.87×4
=0.25×4×9.87
=1×9.87
=9.87;
(2)9.9×5.6
=(10-0.1)×5.6
=10×5.6-0.1×5.6
=56-0.56.
=55.44;
(3)8.45-3.14-1.86
=8.45-(3.14+1.86)
=8.45-5
=3.45;
(4)76.3×27-76.3×17
=76.3×(27-17)
=76.3×10
=763.