[(a-b)² +a-b]/(a-b+1)
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[(a-b)² +a-b]/(a-b+1)
[(a-b)² +(a-b)]/(a-b+1)
=(a-b)(a-b+1)/(a-b+1)
=a-b
[(a-b)² +a-b]/(a-b+1)
=【(a-b)(a-b+1)]/(a-b+1)
=a-b
[(a-b)² +a-b]/(a-b+1)
[(a-b)² +(a-b)]/(a-b+1)
=(a-b)(a-b+1)/(a-b+1)
=a-b
[(a-b)² +a-b]/(a-b+1)
=【(a-b)(a-b+1)]/(a-b+1)
=a-b