问题 解答题
3.6×1994
2
5
+2006.9×6
2
5
答案

3.6×1994

2
5
+2006.9×6
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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