男女生之比是31:29
10g糖放入100g水中,糖的质量与水的质量比是(1:10),糖与糖水的质量比是(1:11)
(2):8=4分之1
63:(210)=0.3 5分之2:(15分之7)=7分之6
75:25 =3 180:0.4 =450 12:42 =0.2857 5:9 =0.555555 2.8:0.7 =4 3分之2:7分之6 =9分之7 5.2:26 =0.2 15分之4:5分之8 =6分之1
男女生之比是31:29
10g糖放入100g水中,糖的质量与水的质量比是(1:10),糖与糖水的质量比是(1:11)
(2):8=4分之1
63:(210)=0.3 5分之2:(15分之7)=7分之6
75:25 =3 180:0.4 =450 12:42 =0.2857 5:9 =0.555555 2.8:0.7 =4 3分之2:7分之6 =9分之7 5.2:26 =0.2 15分之4:5分之8 =6分之1