Question

12.48*5.2+3.85的简便计算

Answer 1

12.48*5.2+3.85
=24.96*2.6+3.85
=（25-0.04）*2.6+3.85
=25*2.6-0.04*2.6+3.85
=260*0.25-0.104+3.85
=260/4-0.104+3.85
=68.85-0.104
=68.746

Answer 2

解:可以将5.2运用拆分法分解为(5+0.2)分别乘以12.48，然后将它们的积同3.85一道相加。计算过程
12.48ⅹ5.2+3.85
=12.48x(5+0.2)+3.85
=62.4+2.496+3.85
=64.896+3.85
=68.746

Answer 3

12.48×5.2+3.85
=6.24×10.4+3.85
=6.24×10+6.24×0.4+3.85
=62.4+6.24×0.5-6.24+3.85
=62.4+3.12十3.85-6.24
=65.52+3.85-6.24
=69.37-6.24
=63.13

Answer 4

12.48+5.2+3.85
=12+0.5一0.02+5+0.2+4一0.2+0.05
=(12+5+4)+(0.5+0.2一0.2)
+(0.05一0.02)
=21+0.5+0.03
=21.53。