A=987654321×123456789 =987654321×（123456788+1） =987654321×123456788+987654321B=987654322×123456788 =（987654321+1）×123456788 =987654321×123456788+123456788∵987654321＞123456788∴A＞B
1×9＝92×8＝1616＞9B＞A
A大
