1-= ×= 6÷= += ×4×0=
×= ×4= 1÷= ÷1= 1-÷=
=
45÷ 3.14×6=
1.4× = 30%÷ =
7.53﹣2.5= 45+215= ×63=
﹣= 24÷= +÷=