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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: Mn help mình iiii Rút gọn : $a, P=\sqrt{x^2-2x+1} – \sqrt{x^2}$

Toán Lớp 9: Mn help mình iiii
Rút gọn :
$a, P=\sqrt{x^2-2x+1} – \sqrt{x^2}$

Comments ( 2 )

  1. P=sqrt(x^2-2x+1)-sqrt(x^2)
    =sqrt((x-1)^2)-|x|
    =|x-1|-|x|

  2. #tnvt
    P=\sqrt{x^2-2x+1}-\sqrt{x^2}
    =\sqrt{x^2-2.x.1+1^2}-|x|
    =\sqrt{(x-1)^2}-|x|
    =|x-1|-|x|

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222-9+11+12:2*14+14 = ? ( )

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