简便计算:401^2-802+1

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简便计算:401^2-802+1

简便计算:401^2-802+1
简便计算:401^2-802+1

简便计算:401^2-802+1
401^2-802+1
=401²-2x401x1+1²
=(401-1)²
=400²
=160000


401^2-802+1
=401²-2×401×1+1²
=(401-1)²
=400²
=160000

401^2-802+1
=401^2-2*1*401+1^2
=(401-1)^2
=400^2
=160000

原式=401^2-2*401+1=(401-1)^2=400^2=160000

401^2-802+1=401^2-401-401+1=401*(401-1)-400=401*400-400=401*309=
(400+1)*(400-1)=160000-1=159999