① - + -
②3.6÷0.8÷1.25
③ ÷ + ×
④72×( - )
2÷24= ×= 16×40%=
112= 51×99≈ 3.5×2÷3.5×5=
①2.65×1.7+7.35×1.7
②36×( + )
③54.2- +4.8-1
④0.7÷[( - )×24]