1/2(x十y)的5方十2(x十y)的3方一三分之四(x十y)3方一1/2(x十y)3方其x=3一y

问题描述:

1/2(x十y)的5方十2(x十y)的3方一三分之四(x十y)3方一1/2(x十y)3方其x=3一y

ay