(x+1)÷(x+25%×16)=3:4
×3= 27÷ = 0.22= 40%÷20=
3.99+0.1= 1÷1%= ÷3= 6- = 0.25× ×4=
5-3.09= = 4.3+3.57= 1.9-2÷4= 4× ÷4× =
642÷6= 0.9×99+0.9= 1.25×80= 2.5÷0.01=
÷ = 2﹣ ﹣ = 3﹣ ﹣ = ( ÷ )×30=