20×= 36÷= -= 1÷=
40×20%= 3.14×3= 12.56÷3.14= 1-÷=
×= 1÷25%=
20+50%x=55
2.4x-1.5×4=10.8
=2.4
①
②
③
④
=
1.8÷18%=
×= 6×= ×= ×1.2=
÷4= 0÷= ÷= ÷0.5=
×16= 2.5× = × = 0× + =
1÷ = ÷ = ÷ = × ÷ =
×14= × = 7.2÷ = 24÷ =
0.36× = ÷4= = =