×= 0×= ÷= +=
×= ×18= ÷5= ()2= 14÷=
0.25×8= 20×10%= += 6--= (-)×15=
①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8