Question

这题简便运算怎么做啊 五年级数学

Answer 1

Answer 2

3.45×9.9=3.45×10-3.45×0.1=34.5-0.345=34.155

Answer 3

3.45×9.9=3.45×(10-0.1)=3.45×10-3.45×0.1=34.5-0.345=34.155

Answer 4

3.45乘（10-0.1）
（3.45乘10）-（3.45乘0.1）
=34.5-0.345
=

Answer 5

3.5X10-0.1X3.5二35一0.35

Answer 6