问题 解答题

用简便方法计算.

5.39+5.25+4.61+4.75

5.83-(0.46+1.83)-0.54.

答案

5.39+5.25+4.61+4.75

=(5.39+4.61)+(5.25+4.75),

=10+10,

=20;

5.83-(0.46+1.83)-0.54.

=5.83-0.46-1.83-0.54,

=5.83-1.83-(0.46+0.54),

=4-1,

=3.

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