250m=km m2=dm2
0.75× = ÷ = × = ×14=
÷ = 48÷ = ÷ = 3.2÷ =
9×40%= ÷50%= ÷9= 75% × 16=
①7.2×( - )
② ÷ ÷
③ ×52%+0.75×0.48
④ ×( + )
⑤15×
⑥ ×[ ÷( - )]