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

Toán Lớp 9: Tách `1)` $x-5\sqrt{x} +6$ `2)` $a\sqrt{a}+\sqrt{a}-a-1$

Toán Lớp 9: Tách
1) $x-5\sqrt{x} +6$
2) $a\sqrt{a}+\sqrt{a}-a-1$

Comments ( 2 )

  1.  1) ${x – 5\sqrt{x} + 6}$
    = ${(x + 1\sqrt{x}) – (6\sqrt{x}+ 6)}$
    = ${ \sqrt{x} (x + 1)}$ – ${6(\sqrt{x} – 1)}$
    = ${ (\sqrt{x} -6)}$ – ${(\sqrt{x} – 1)}$
    2) ${a\sqrt{a}}$ + $\sqrt{a}$ – ${a}$ – 1 
    = \sqrt{a}(a+1) – (a+1)
    = (\sqrt{a}-1) (a+1)

  2. Giải đáp+Lời giải và giải thích chi tiết:
    x-5\sqrt{x}+6
    =x-2 \sqrt{x}-3\sqrt{x}+6
    =\sqrt{x}(\sqrt{x}-2)-3(\sqrt{x}-2)
    =(\sqrt{x}-2)(\sqrt{x}-3)
    a\sqrt{a}+\sqrt{a}-a-1
    =\sqrt{a}(a+1)-(a+1)
    =(a+1)(\sqrt{a}-1)

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