A=(987654322-1)×(123456788+1)
=987654322×123456788-123456788+987654322-1
=B-123456788+987654322-1
所以A>B
...............................自己想 这么简单
设987654321=x 123456789=y
A=xy B=(x+1)(y-1)
A-B=xy-(x+1)(y-1)=xy-xy+x-y+1=x-y+1=987654321-123456789+1>0
所以A>B
B大于A