①(1- × )÷
②21÷( + )÷
③16.1×99+16.1
④64.8÷12.5÷8
⑤37×101
⑥12.5×16×2.5
⑦ -( ÷ + )
⑧51×
⑨36×( + - )
⑩ ÷[( + )× ]
⑪ × + × -
⑫( - )×14×9