2Y×3.14+2Y=20.56怎么解

问题描述:

2Y×3.14+2Y=20.56怎么解

即为:
2×3.14×Y+2Y=20.56
6.28Y+2Y=20.56
(6.28+2)Y=20.56
8.28Y=20.56
解得:Y≈2.48