(450÷6)÷(25÷)=18 (450×)÷(25×4)=18
450÷(25×3)= 450÷(25÷5)=
(450×5)÷25= (450÷6)÷25=
235-=0 ×11=110 ÷12=36
写作: 304050000
写作: 200034000
写作:
25×13×20
17×86+17×14
350÷[(86-72)×5]