Question

用简便方法计算下面各题．8.54÷2.5÷0.4（9.37+9.37+9

用简便方法计算下面各题．8.54÷2.5÷0.4（9.37+9.37+9.37+9.37）×2.53.6×10.1-0.362.22×9.9+6.66×6.7．

Answer 1

（1）8.54÷2.5÷0.4
=8.54÷（2.5×0.4）
=8.54÷1
=8.54；

（2）（9.37+9.37+9.37+9.37）×2.5
=9.37×4×2.5
=9.37×（4×2.5）
=9.37×10
=93.7；

（3）3.6×10.1-0.36
=3.6×10.1-3.6×0.1
=3.6×（10.1-0.1）
=3.6×10
=36；

（4）2.22×9.9+6.66×6.7
=2.22×3×3.3+6.66×6.7
=6.66×3.3+6.66×6.7
=6.66×（3.3+6.7）
=6.66×10
=66.6．