①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]
①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8