含盐a%的盐水x千克,加入y千克水后,盐水的浓度为( )注意!只有这几个选项!不是ax%/((1-a%)x+y)!A.a/(x+y) B.ax%/(x+y) C.(a+x)%/(x+y) D.(a/(x+y))%

含盐a%的盐水x千克,加入y千克水后,盐水的浓度为( )注意!只有这几个选项!不是ax%/((1-a%)x+y)!A.a/(x+y) B.ax%/(x+y) C.(a+x)%/(x+y) D.(a/(x+y))%
含盐a%的盐水x千克,加入y千克水后,盐水的浓度为( )
注意!只有这几个选项!不是ax%/((1-a%)x+y)!A.a/(x+y) B.ax%/(x+y) C.(a+x)%/(x+y) D.(a/(x+y))%

含盐a%的盐水x千克,加入y千克水后,盐水的浓度为( )注意!只有这几个选项!不是ax%/((1-a%)x+y)!A.a/(x+y) B.ax%/(x+y) C.(a+x)%/(x+y) D.(a/(x+y))%
盐水浓度=盐质量/盐水质量=(a℅x)/(x+y)
正确答案应该选B

B