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

Toán Lớp 7: giúp vs mn (3x-2)^2 + (2x+3)^2=(2x-5).(9x+1)-5x^2-68

Toán Lớp 7: giúp vs mn
(3x-2)^2 + (2x+3)^2=(2x-5).(9x+1)-5x^2-68

Comments ( 2 )

  1. (3x-2)² + (2x+3)²=(2x-5).(9x+1)-5x²-68
    ⇔9x²-12x+4+4x²+12x+9=18x²+2x-45x-5-5x²-68
    ⇔9x²+4x²-18x²+5x²-12x+12x-2x+45x=-4-9-5-68
    ⇔43x=-86
    ⇔x=-2
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $(3x-2)^{2}$+$(2x+3)^{2}$=(2x-5).(9x+1)-$5x^{2}$-68
    $9x^{2}$-12x+4  +$4x^{2}$+12x+9=$18x^{2}$+2x-45x-5-$5x^{2}$  -68
    43x=-86
    x=-2

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

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