9分之4乘2.85+2.85乘9分之5(简算)

问题描述:

9分之4乘2.85+2.85乘9分之5(简算)

4/9*2.85+2.85*5/9
=2.85*(4/9+5/9)
=2.85*1
=2.85

9分之4乘2.85+2.85乘9分之5
=(4/9+5/9)×2.85
=1×2.85
=2.85

4/9×2.85+2.85×5/9
=(4/9+5/9)×2.85
=1×2.85
=2.85