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

Toán Lớp 8: tìm x a) x( x – 1 ) + 2x – 2 = 0 b) ( x + 3 ) tất cả mũ 2 – ( x + 2 )( 2 – x ) = 4x + 17

Tháng Tư 2, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: tìm x
a) x( x – 1 ) + 2x – 2 = 0
b) ( x + 3 ) tất cả mũ 2 – ( x + 2 )( 2 – x ) = 4x + 17

Comments ( 1 )

  1. baoquyen
    baoquyen
    2 Tháng Tư, 2022 at 11:47 chiều
    Reply
    #text(Chẻ tộc)
    a) x( x – 1 ) + 2x – 2 = 0
    <=> x(x – 1) + 2(x – 1) = 0
    <=> (x – 1)(x+ 2)=0
    <=>[{:(x-1=0),(x+2=0):}
    <=>[{:(x=1),(x=-2):}
    Vậy x=1 hoặc x=-2
    b) ( x + 3 ) ^2 – ( x + 2 )( 2 – x ) = 4x + 17
    <=> ( x^2 +6x+ 9 ) + (x+2 )( x -2) -4x -17=0
    <=> x^2 +6x+ 9 + (x^2-4) -4x – 17=0
    <=> x^2 +6x+ 9 + x^2-4 -4x – 17=0
    <=>2 x^2 +2x-12=0
    <=>(2 x^2 -4x)+(6x- 12)=0
    <=>2x( x -2)+6(x-2)=0
    <=>( x -2)(2x+6)=0
    <=>[{:(x-2=0),(2x+6=0):}
    <=>[{:(x=2),(2x=-6):}
    <=>[{:(x=2),(x=-3):}
    Vậy x=2 hoặc x=-3

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

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