①4.4﹣1.02+1.6﹣0.98
②24×205
③37×[178﹣(70+78)]
①(135+75)÷(5×14)
②[(216-24)÷3]+198
①1700÷25÷4
②273- (273-168)
③241×48-48×116
④19.3+8.26+5.74
⑤15.6-4.13+3.87
⑥810÷[81÷(56-29)]
①0.25×16.2×4
②375+450÷18×25
③35.6- +34.4-
④ × + ÷
⑤[( - )× ]÷
⑥3.5× +5.5×80%+0.8