问题
解答题
简算
31.6×2.5-2.4×31.6
13.7×6.5+4.5×13.7-13.7
8.76×10.1.
答案
(1)31.6×2.5-2.4×31.6,
=31.6×(2.5-2.4),
=31.6×0.1,
=3.16;
(2)13.7×6.5+4.5×13.7-13.7,
=13.7×(6.5+4.5-1),
=13.7×10,
=137;
(3)8.76×10.1,
=8.76×(10+0.1),
=8.76×10+8.76×0.1,
=87.6+0.876,
=88.476