7分之5加25分之19乘4加25分之21乘19

2025-04-04 13:24:55
推荐回答(1个)
回答1:

5/7+19/25×4+21/25×19
=5/7+19/25×4+19/25×21
=5/7+19/25×(4+21)
=5/7+19
=19又5/7