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.