问题 解答题

用我喜欢的方法计算:

13-4.85-3.15

70.9-1.25-1.75.

答案

13-4.85-3.15,

=13-(4.85+3.15),

=13-8,

=5;

70.9-1.25-1.75,

=70.9-(1.25+1.75),

=70.9-3,

=67.9.

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