Phân tích và chứng minh

T

thienbinhgirl



$x^2+x-6=x^2+3x-2x-6=(x-2)(x+3)$
$x^2+5x+6=x^2+3x+2x+6=(x+2)(x+3)$
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T

thienbinhgirl

...........bài 2
$55^(n+1)-55^n=55^5+55-55^n=55^n(55-1)=55^n.54$
Vậy chia hết cho 54...................................................................
 
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