202.2÷0.1= 13÷11= 5.6+4.4-0.53=
0.5³= ( )÷7= 1.8×0.5÷1.8×0.5=
1- = + = ×2= + = - =
18× = ÷6= ÷ = a-0.4a= + + + =
12和18 ,
11和33 ,
5和13 ,
△= ○= □=
360÷6+420÷6 (360+420)÷6
469÷7-329÷7 (469-329)÷7
a÷c+b÷c=(□+□) ÷c
a÷c-b÷c=(□○□) ○□
36÷3+84÷3
(4500-90)÷45
288÷4-168÷4-96÷4