①2.5÷ ×
②3.96-0.65+7.04-1.35
③12×103-4500÷75
④25× ÷ ×
⑤ ×131+ ×69
⑥ ÷[( - )×
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×
7.28﹣(1.28+0.25) ÷[×(0.5+)]
23× 3.7×+1.3÷