400.6×7一2003×0.4的简便计算

问题描述:

400.6×7一2003×0.4的简便计算

400.6×7一2003×0.4
=4006×0.7-2003×0.4
=2003×2×0.7-2003×0.4
=2003×(1.4-0.4)
=2003
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