①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8
78﹣0.8=
632÷70=
10﹣0.9= 28+82= 20×5%= +×0=
4.8÷0.8= += ×= 1÷-1=