Question

2．计算下面各题，能简算的就简算．  
0.25×6.82×4
5.52×0.6+8.9
11×7.5-7.5
4.36×0.7+5.64×0.7
3.96÷0.4÷2.5．

Answer 1

分析 ①运用乘法交换律可简便计算，
②先算乘法再算加法，
③④逆用乘法分配律可简便计算，
⑤根据除法的性质计算．

解答 解：①0.25×6.82×4
=0.25×4×6.28
=1×6.28
=6.28

②5.52×0.6+8.9
=3.312+8.9
=12.212

③11×7.5-7.5
=（11-1）×7.5
=10×7.5
=75

④4.36×0.7+5.64×0.7
=（4.36+5.64）×0.7
=10×0.7
=7

⑤3.96÷0.4÷2.5
=3.96÷（0.4×2.5）
=3.96÷1
=3.96

点评 此题考查小数四则混合运算顺序和灵活运用运算定律，分析数据找到正确的计算方法．