Question

0.4y+0.9/0.5-0.3+0.2y/0.3=1

Answer 1

数据有点别扭

0.4y+0.9/0.5-0.3+0.2y/0.3=1

即(4y+9)/5-(3+2y)/3=1

两边同时乘以15

3(4y+9)-5(3+2y)=15

12y+27-15-10y=15

∴ 2y=3

∴ y=1.5