问题 解答题

巧算.

(1)11.59-6.25+8.41

(2)23.75+16.39-20.75

(3)0.129+0.78-0.029

(4)9.68-0.6-0.08.

答案

(1)11.59-6.25+8.41,

=11.59+8.41-6.25,

=20-6.25,

=13.75;

(2)23.75+16.39-20.75,

=23.75-20.75+16.39,

=3+16.39,

=19.39;

(3)0.129+0.78-0.029,

=0.129-0.029+0.78,

=0.1+0.78,

=0.88;

(4)9.68-0.6-0.08,

=9.68-(0.6+0.08),

=9.68-0.68,

=9.

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