(1-1) 770÷7÷11
=770÷(7 A 11)
= B
A 是多少?(填入+-×÷)
(1-2) 770÷7÷11
B 是多少?(填入+-×÷)
=990÷( A ×9)
=990÷ B
A 是多少?
B 是多少?
C 是多少?
=7350÷( A × B )
=7350÷ C
= D
D 是多少?
=963÷( A × B )
=963÷ C
=990÷( A × B )
=990÷ C
=900÷( A × B )
=900÷ C
=720÷( A × B )
=720÷ C
=1800÷( A × B )
=1800÷ C
=952÷( A × B )
= C ÷ D
= E
E 是多少?
=825÷ A