10 ( )
—= —=( ):( )=0.25=( )%
( ) 20
甲比乙多1,乙比甲少( )
—
5
10 (5 )
—= —=(1 ):( 4)=0.25=(25 )%
(40 ) 20
甲比乙多1,乙比甲少(1 )