2a+3*0.8a+5*0.8*0.8a=38怎么解
问题描述:
2a+3*0.8a+5*0.8*0.8a=38怎么解
答
2a+2.4a+3.2a=38
7.6a=38
a=5
2a+3*0.8a+5*0.8*0.8a=38怎么解
2a+2.4a+3.2a=38
7.6a=38
a=5