a(a-5)-(a+6)(a-6)
a(a-5)-(a+6)(a-6)(x+y)(x-y)(x2+y2)9982-42003×2001-20022...
a(a-5)-(a+6)(a-6) ( x+y)( x-y)( x2+y2) 9982-4 2003×2001-20022
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a(a-5)-(a+6)(a-6)
=a^2-5a-(a^2-36)
=a^2-5a-a^2+36
=36-5a
( x+y)( x-y)( x2+y2)
=(x^2-y^2)(x^2+y^2)
=x^4-y^4
998^2-4
=(998+2)(998-2)
=1000*996
=996000
2003×2001-2002^2
=(2002+1)×(2002-1)-2002^2
=2002^2-1-2002^2
=-1
=a^2-5a-(a^2-36)
=a^2-5a-a^2+36
=36-5a
( x+y)( x-y)( x2+y2)
=(x^2-y^2)(x^2+y^2)
=x^4-y^4
998^2-4
=(998+2)(998-2)
=1000*996
=996000
2003×2001-2002^2
=(2002+1)×(2002-1)-2002^2
=2002^2-1-2002^2
=-1
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