奇妙的得数(一)

7×9=63

77×99=7623

777×999=776223

7777×9999=77762223

77777×99999=7777622223

777777×999999=777776222223

7777777×9999999=77777762222223

77777777×99999999=7777777622222223

777777777×999999999=777777776222222223