①120×3+850
②618-72×5
③(325+75)×6
①985-499+108 =985-607 =378 ( ) 改正: ②620-(320+186) =300+186 =486 ( ) 改正:
①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]