①15× +186×25%﹣0.25
②( )÷
③3333×3334+2222×9999
④300÷12.5÷8
① ×58﹣58×
②525+450÷15
③200﹣12.8﹣7.2
④24÷ ×( ﹣ )
⑤2.5×1.25×0.8
⑥ ×[ +( ﹣25%)]