Question

9.9x6.6+6.3x10.2简便计算？

Answer 1

原式=10x6.6-0.1ⅹ6.6+6.3x10+0.2x6.3
=66-0.66+63+1.26
=129.6

Answer 2

解：9.9×6.6+6.3×10.2
=6.6×（10-0.1）+6.3×（10+0.2）
=66-0.66+63+1.26
=66+63+（1.26-0.66）
=129+0.6
=129.6

Answer 3

9.9=10－0.1,10.2=10+0.2,所以9.9×6.6+6.3×10.2=(10－0.1)×6.6+6.3×(10+0.2)=10×6.6－0.1×6.6+6.3×10+6.3×0.2=66－0.66+63+1.26=129+0.6=129.6

Answer 4

9.9×6.6+6.3×10.2多简便计算是：
6.6×（10-0.1）+6.3×（10+0.2）
=66-0.66+63+12.6
=（66+63）+（12.6-0.66）
=129+11.94
=140.94

Answer 5

9.9×6.6+6.3×10.2。用简便的方法可以变化成10-0.1括号×6.6+6.3×括号10+0.2。