×12= 14÷=
0.5×0.6= 1-= ÷2=
∶
0.5千米∶25米
1.2∶8
①
②
③2.7-3x=
﹣= ÷18= 25×= 45÷= +=
×= ÷= ×= ÷= ×÷=
× ×2= 1 -45%= 52-42=
12%×300= ÷5× = ÷0.5= 120÷10%=
×20= ÷= 10÷= 0.6×=
1÷= ×= ÷= ÷=