× = × = 18× = 3.6× =
÷ = ÷ = ×0.18= 0.25÷ =
÷2= 4÷75%=
①( + )×54
② × ÷
③ - ÷ -
④ × - ÷
⑤ ÷( - )
⑥ ÷[( - )× ]