①15× +186×25%﹣0.25
②( )÷
③3333×3334+2222×9999
④300÷12.5÷8
4.5÷× 37.36﹣6.37﹣13.63 ×(+)
(-+)÷ ×+87.5%× ×[-(-)]
1.05×(3.7﹣0.7)÷6.3 73×40%+27× -(+)×50%