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简算:5.01-1.9+4.990.65×6.4-0.65×5.40.4×99+0.41.25×3.2×0.25.

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/29 11:22:14
简算:
5.01-1.9+4.990.65×6.4-0.65×5.4
0.4×99+0.41.25×3.2×0.25.
(1)5.01-1.9+4.99
=5.01+4.99-1.9
=10-1.9
=8.1;
(2)0.65×6.4-0.65×5.4
=0.65×(6.4-5.4)
=0.65×1
=0.65;
(3)0.4×99+0.4
=0.4×(99+1)
=0.4×100
=40;
(4)1.25×3.2×0.25
=1.25×0.8×4×0.25
=(1.25×0.8)×(4×0.25)
=1×1
=1.