275+399=
20×35=
13.7-7=
63×0.625+16×+62.5% 4.66-(2.66+25%)- ×14×17
①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8