Question

9.9x6.6+6.3x10.2简便计算？

Answer 1

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
=66+63+（1.26-0.66）
=129+0.6
=129.6

Answer 2

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

Answer 3

因为9.9=10-0.1，10.2=10+0.2。所以原式等于6.6×（10-0.1）+6.3×（10+0.2）运用乘法分配律就是66-0.66+63+6.3×0.2=129.6

Answer 4

9.9*6.6+6.3*10.2
=（10-0.1）6.6+6.3（10+0.2）
=10*6.6-0.66+6.3*10+1.26
=10（6.6+6.3）+1.26-0.66
=129+0.6
=129.6

Answer 5

这就是使用简便方法来进行计算,6.9=0.69*10 那么就得到0.69+9.9*6.9=0.69+0.69*99=0.69*(1+99)=0.69*100=69 所以乘积为69