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

Toán Lớp 9: -4x – 9 √x + 3/x + 3√x +2 + √x – 1/ √x+1 – 2 √x -1/ √x+2

Home/ Toán Lớp 9: -4x – 9 √x + 3/x + 3√x +2 + √x – 1/ √x+1 – 2 √x -1/ √x+2

Toán Lớp 9: -4x – 9 √x + 3/x + 3√x +2 + √x – 1/ √x+1 – 2 √x -1/ √x+2

Tháng Hai 20, 2023 Toán học 1 Comment 0 views

Toán Lớp 9: -4x – 9 √x + 3/x + 3√x +2 + √x – 1/ √x+1 – 2 √x -1/ √x+2

Comments ( 1 )

  1. behocgioitoan
    behocgioitoan
    20 Tháng Hai, 2023 at 2:28 sáng
    Reply
    #AkaShi
    (-4x-9\sqrt{x}+3)/(x+3\sqrt{x}+2)+(\sqrt{x}-1)/(\sqrt{x}+1)-(2\sqrt{x}-1)/(\sqrt{x}+2) Đk: x >= 0
    =(-4x-9\sqrt{x}+3)/(x+2\sqrt{x}+\sqrt{x}+2)+(\sqrt{x}-1)/(\sqrt{x}+1)-(2\sqrt{x}-1)/(\sqrt{x}+2) 
    =(-4x-9\sqrt{x}+3)/((\sqrt{x}+1)(\sqrt{x}+2))+(\sqrt{x}-1)/(\sqrt{x}+1)-(2\sqrt{x}-1)/(\sqrt{x}+2) 
    =(-4x-9\sqrt{x}+3)/((\sqrt{x}+1)(\sqrt{x}+2))+((\sqrt{x}-1)(\sqrt{x}+2))/((\sqrt{x}+1)(\sqrt{x}+2))-((2\sqrt{x}-1)(\sqrt{x}+1))/((\sqrt{x}+1)(\sqrt{x}+2)) 
    =(-4x-9\sqrt{x}+3+x+\sqrt{x}-2-2x-\sqrt{x}+1)/((\sqrt{x}+1)(\sqrt{x}+2))
    =(-5x-9\sqrt{x}+2)/((\sqrt{x}+1)(\sqrt{x}+2))
    =(-5x-10\sqrt{x}+\sqrt{x}+2)/((\sqrt{x}+1)(\sqrt{x}+2))
    =((\sqrt{x}+2)(-5\sqrt{x}+1))/((\sqrt{x}+1)(\sqrt{x}+2))
    =(-5\sqrt{x}+1)/(\sqrt{x}+1)

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

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