× = 48×25%= ÷ = - ÷3=
×2.8= ÷ = ÷2÷ = 15×( + )=
①42÷( + )
② × + ×75%
③( - )×( + )
④2.5×3.2×12.5
⑤57×
⑥ ×[ ÷( - )]