1-60%= 3.14×3= ÷ = 42×5%=
0.5+25%= 0×30%= ÷10%= 37%÷100%=
×4= 16÷ = × = 0.8× =
0.25+ = ×2.4= ÷4= ÷4÷ =
∶
0.5千米∶25米
1.2∶8
× = × = × = 1.2× =
÷4= 42÷ = ÷ = ÷0.1=