求大神解答要步骤啊啊啊

求大神解答要步骤啊啊啊要步骤步骤
2025-04-06 10:35:59
推荐回答(1个)
回答1:

x/(3/2) - x/(15/4)=31.2
2x/3 - 4x/15=31.2
两边同乘15:
10x - 4x=468
6x=468
∴x=78