①600﹣300÷20×5
②(4.8﹣3.8÷2)×0.3
③3.45×99×2+6.9
④(8+ )÷4
⑤ ÷9+ ×
⑥ ÷[ ×( - )]
①120+180÷5×6
②9.43﹣(0.39+2.43)
③
④
⑤()×14+
⑥