Vì x=1001
=>`x^2`-2x+1=`1001^2`-2*1001+1
=1001*1001-2*1001+1
=1001*999+1
=1001*1000+1-1001
=1001000-1000
=1000000
Đáp án:
x^2-2x+1 biết x= 1001
=x^2-2.x+1^2
=(x-1)^2
thay x=1001 và đa thức trên
=(1001-1)^2
=1000^2
nếu ko dùng HĐT
x^2-2x+1 biết x=1001
1001-2.1001+1
1002001-2002+1
1002001-2001
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