x/物闷雀(1/2)=(4/9)*(1/4)
x=(4/9)*(1/4)*(1/罩埋2)
=(1/9)*(1/罩早2)
=1/18
x除以2分之1=9分之4乘4分之1
x/物闷雀(1/2)=(4/9)*(1/4)
x=(4/9)*(1/4)*(1/罩埋2)
=(1/9)*(1/罩早2)
=1/18
x/物闷雀(1/2)=(4/9)*(1/4)
x=(4/9)*(1/4)*(1/罩埋2)
=(1/9)*(1/罩早2)
=1/18
x/物闷雀(1/2)=(4/9)*(1/4)
x=(4/9)*(1/4)*(1/罩埋2)
=(1/9)*(1/罩早2)
=1/18