2.5×0.4= - = 63÷ = 1-0.75= + =
× = 10÷0.5= 281÷39≈ 40× = + =
8×7×1.25= 2─=
32 + 42= 3.25÷0.25 =
420+590= 72÷3= 0.8×4=
0.24+0.8= 1.1-0.11= 3.2+0.15= 0÷4.5=
a× a+ (a>0) 4.32÷ 4.32×0.25