问题 填空题
7.2×61
3
10
+73.8×2
4
5
=______.
答案

7.2×61

3
10
+73.8×2
4
5

=7.2×61.3+(61.3+12.5)×2.8,

=(7.2+2.8)×61.3+12.5×2.8,

=613+35,

=648.

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