2a+3b=2,那么7-6a-9b=多少?
问题描述:
2a+3b=2,那么7-6a-9b=多少?
答
7-6a-9b=7-3(2a+3b)=7-3*2
=7-6=1
2a+3b=2,那么7-6a-9b=多少?
7-6a-9b=7-3(2a+3b)=7-3*2
=7-6=1