(1)
=3 15
=3÷3 15÷3
;1 5
(2)
=25 45
=25÷5 45÷5
;5 9
(3)
=30 75
=30÷15 75÷15
;2 5
(4)
=54 90
=54÷18 90÷18
;3 5
(5)
=12 21
=12÷3 21÷3
;4 7
(6)
=14 84
=14÷14 84÷14
;1 6
(7)
=18 78
=18÷6 78÷6
.3 13