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hellangel98

Ta co : x= 6 suy ra 7= x+ 1. Thay vao ta có
A= x^10 - (x+1)x^9 + (x+1)x^8 -..... - (x+1)x + 2
= x^10 - x^10 -x^9 + x^9 +x^8 - x^8-......+x^2-x^2 -x +2
= -x + 2= -6+2=-4
 
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