Question

【题目】计算下列各式，能简算的要简算． ①1.25×3.69×2.5
②32.4÷2.5÷0.4
③21.3×5.34﹣1.3×5.34．

Answer 1

【答案】解：①1.25×3.69×2.5 =4.6125×2.5
=11.53125
②32.4÷2.5÷0.4
=32.4÷（2.5×0.4）
=32.5×1
=32.5
③21.3×5.34﹣1.3×5.34
=（21.3﹣1.3）×5.34
=20×5.34
=106.8
【解析】①根据四则混合运算的运算顺序计算即可；②根据除法性质进行计算；③根据乘法分配律进行计算．