①32×12.5×2.5
②4.28+7.37+5.72+2.63
③ ÷[( - )× ]
④
+x= x﹣15%x=170 x:=:2
+80%× ÷× [×(4-)]÷
①
②
③0.79×99+0.79
④3.8×97+0.38×30
⑤
⑥(﹣)×9×12