①1435-279+565
②304×17+83
③69×108÷18
④(1000-244)÷42
①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8