题目内容
【题目】计算下面各题,能简便计算的要简使计算
12.5×8.8 30.9÷2.5÷0.4
(8.1﹣5.4)÷3.6+82.5 9.88×9+9.88
【答案】110;3.9;83.25;98.8
【解析】
①12.5×8.8
=12.5×(8×1.1)
=(12.5×8)×1.1
=100×1.1
=110
②30.9÷2.5÷0.4
=30.9÷(2.5×0.4)
=30.9÷1
=3.9
③(8.1﹣5.4)÷3.6+82.5
=2.7÷3.6+82.5
=0.75+82.5
=83.25
④9.88×9+9.88
=9.88×(9+1)
=9.88×10
=98.8