3.6×199425+2006.9×625.-数学

题目简介

3.6×199425+2006.9×625.-数学

题目详情

3.6×1994
2
5
+2006.9×6
2
5
题型:解答题难度:中档来源:不详

答案

3.6×1994class="stub"2
5
+2006.9×6class="stub"2
5

=3.6×1994.4+2006.9×6.4,
=3.6×(2000-5.6)+(2000+6.9)×6.4,
=(3.6+6.4)×2000-3.6×5.6+6.9×6.4,
=10×2000+6.9×6.4-3.6×5.6,
=20000+0.3×23×0.8×8-0.3×12×0.8×7,
=20000+0.3×0.8×(23×8-12×7),
=20000+0.24×(184-84),
=20000+24,
=20024.

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