×16= 2.5×20= ×= 0× + =
1÷ = ÷ = ÷ = × ÷ =
①[1-( )]÷
②( - )× +
③5÷[( + )× ]
④( + )×86
⑤ ×33+ ×46+
⑥( + )×9×7