Question

2.22×9.9+6.66×6.7，简便运算？

Answer 1

答：2.22x9.9+6.66x6.7
=2.22x3x3.3+6.66x6.7
=6.66x3.3+6.66x6.7
=6.66x（3.3+6.7）
=6.66x10
=66.6

Answer 2

利用积的不变规律把2.22和6.66转化成相同的数，然后利用乘法分配律
如把2.22转化成6.66
2.22×9.9+6.66×6.7
=（2.22×3）×（9.9÷3）+6.66×6.7
=6.66×3.3+6.66×6.7
=6.66×（3.3+6.7）
=6.66×10
=66.6

Answer 3

简便计算如下
2.22×9.9+6.66×6.7
=2.22×9.9+2.22×3×6.7
=2.22×(9.9+3×6.7)
=2.22×30
=66.6

Answer 4

2.22*9.9+6.66*6.7=2.22*3*3.3+6.66*6.7=6.66*3.3+6.66*6.7=6.66*（3*3+6.7）=6.66*10=66.6

Answer 5

2.22*9.9+6.66*6.7
=2.22*3.3*3+6.66*6.7
=6.66*3.3+6.66*6.7
=6.66（3.3+6.7）
=6.66*10
=66.6
这样计算就简便一点