①600﹣300÷20×5
②(4.8﹣3.8÷2)×0.3
③3.45×99×2+6.9
④(8+ )÷4
⑤ ÷9+ ×
⑥ ÷[ ×( - )]
①
②()÷
③
④-(÷-)
⑤19×(+)×37
⑥÷[(-)×6]
①210÷35+12×109
②2.5×1.25×16
③()×12
④ [()]
261﹣99= 17÷34= 2.1+0.79= 80×125%=
÷36= 38.38÷38= +×0= ×3÷×3=