(31-1) 101×23+99×23
=( A + B )×23
= C ×23
= D
A 是多少?
(31-2) 101×23+99×23
B 是多少?
(31-3) 101×23+99×23
C 是多少?
(31-4) 101×23+99×23
D 是多少?
=39×( A + B )
=39× C
=36×( A + B )
=36× C
=( A + B )×26
= C ×26
=75×( A - B )
=75× C
=57×( A + B )
=57× C
=( A - B )×59
= C ×59
= A ×(1+ B )
=29× C
=( A -1)× B
=30× C
=( A - B )×54
= C × D
= E
E 是多少?