1.4%x+3.7%(20-x)=0.625 怎样解
问题描述:
1.4%x+3.7%(20-x)=0.625 怎样解
答
1.4%x+3.7%(20-x)=0.625
0.014x+0.74-0.037x=0.625
0.037x-0.014x=0.74-0.625
0.023x=0.115
x=0.115/0.023
x=5