问题
解答题
简便计算
12.8-0.5×0.5-0.75
1.25×3.2×0.8
8.37×1.4+8.6×8.37.
答案
(1)12.8-0.5×0.5-0.75,
=12.8-0.25-0.75,
=12.8-(0.25+0.75),
=12.8-1,
=11.8;
(2)1.25×3.2×0.8,
=1.25×0.8×3.2,
=1×3.2,
=3.2;
(3)8.37×1.4+8.6×8.37,
=8.37×(1.4+8.6),
=8.37×10,
=83.7.