Question

计算4．58＊3．2＋8．9＊5．42＋5．7＊4．58

要简便运算，还要过程．

Answer 1

4.58*3.2+8.9*5.42+5.7*4.58
=4.58*(3.2+5.7)+8.9*5.42
=4.58*8.9+8.9*5.42
=8.9*(4.58+5.42)
=8.9*10
=89

Answer 2

＝4.58×3.2＋8.9×（10-4.58）＋4.58×5.7
＝4.58×（3.2-8.9+5.7）＋89
＝89