( )^2=m^2-2m+1

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()^2=m^2-2m+1()^2=m^2-2m+1()^2=m^2-2m+1m²-2m+1=m²-2×m×1+1²=﹙m-1﹚²(M-1)^2=M^2-M-M

( )^2=m^2-2m+1
( )^2=m^2-2m+1

( )^2=m^2-2m+1
m²-2m+1
=m²-2×m×1+1²
=﹙m-1﹚²

(M-1)^2=M^2-M-M+1^2=M^2-2M+1

这个是平方公式:
(m-1)^2=m^2-2m+1;