2÷24= ×= 16×40%=
112= 51×99≈ 3.5×2÷3.5×5=
0.2× = ×4÷ ×4= ÷ =
16÷20%= 3.2+ - +3.2= × ×0=
( + )× +
( ﹣ + )÷
5× +14÷4﹣19×0.25
①600﹣300÷20×5
②(4.8﹣3.8÷2)×0.3
③3.45×99×2+6.9
④(8+ )÷4
⑤ ÷9+ ×
⑥ ÷[ ×( - )]