问题
解答题
计算下面各题．
2.5×13+0.9
7.23×99-20.5
0.4×2.35×25
0.9×4.8-2.17×0.6．
答案
（1）2.5×13+0.9
=32.5+0.9
=33.4；
（2）7.23×99-20.5
=715.77-20.5
=695.27；
（3）0.4×2.35×25
=（0.4×25）×2.35
=10×2.35
=23.5；
（4）0.9×4.8-2.17×0.6
=4.32-1.302
=3.018．