问题 解答题

脱式计算.(能简算的要简算)

15-8.13-1.87

5.14+3.225-6.302

3.95+5.36-1.95

13.67-(5.45+3.67)

答案

①15-8.13-1.87,

=15-(8.13+1.87),

=15-10,

=5;

②5.14+3.225-6.302,

=8.365-6.302,

=2.063;

③3.95+5.36-1.95,

=(3.95-1.95)+5.36,

=2+5.36,

=7.36;

④13.67-(5.45+3.67),

=13.67-3.67-5.45,

=10-5.45,

=4.55.

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