(450×)÷(25×4)=18
(450×3)÷25=
450÷(25÷5)=
450÷(25×2)=
480÷8÷4480÷32 326÷45426÷45
569÷55569÷58 693÷33593÷33
①305×29=
②590×700=
③※187×46=
④※353÷17=
①800÷25
②640÷40