Question

9.09·9.09+9.09如何巧算？

Answer 1

后面的9.09可以看成9.09x1、然后利用乘法分配律就可以了、最好用两次
原式= 9.09x（9.09+1）
= 9.09x10.09
= 9.09x（10+0.09）
= 9.09x10+9.09x0.09
= 90.9+0.8181
= 91.7181

Answer 2

9.09*（9.09+1）=9.09*10.09=9.09*（10+0.09）=90.9+9.09*（0.1-0.01）=90.9+0.909-0.0909=90.9+0.8181=91.7181

Answer 3

观察两个加项，都有9.09，提出相同的乘数后计算，具体计算过程如下：
9.09x9.09+9.09
=9.09x9.09+9.09x1
=9.09x（9.09+1）
=9.09x10.09
=91.7181
望采纳，谢谢！

Answer 4

9.09×9.09+9.09
=9.09×9.09+9.09×1
=9.09×(9.09+1)
=9.09×10.09
=9.09×(10+0.09)
=9.09×10+9.09×0.09
=90.9+0.8181
=91.7181

Answer 5

9.09×9.09+9.09
=9.09×（9.09+1）
=9.09×10.09
=（9+0.09）×（10+0.09）
=9×10+9×0.09+0.09×10+0.09×0.09
=90+0.81+0.9+0.0081
=91.7181