7分之5减9分之5乘7分之5怎么做,要过程?

2024-11-01 16:27:05
推荐回答(2个)
回答1:

5/7-5/9*5/7
=(1-5/9)*5/7
=4/9*5/7
=20/63

回答2:

5/7-5/9×5/7
=5/7×(1-5/9)
=5/7×4/9
=20/63