pfW^îPVj

6^2-5^2=(6+5)(6-5)=11

56^-45^2=(56+45)(56-45)=101E111111

556^2-445^2=(556+445)(556-445)=1001E111111111

7^2-4^2=(7+4)(7-4)=33

67^-34^2=(67+34)(67-34)=101E333333

667^2-334^2=(667+334)(667-334)=1001E333333333

8^2-3^2=(8+3)(8-3)=55

78^2-23^2=(78+23)(78-23)=101E555555

778^2-223^2=(778+223)(778-223)=1001E555555555

9^2-2^2=(9+2)(9-2)=77

89^2-12^2=(89+12)(89-12)=101E777777

889^2-112^2=(889+112)(889-112)=1001E777777777