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

Toán Lớp 8: (3-2x)(2+3x)+3x-(3x-4)^2 Rút gọn

Toán Lớp 8: (3-2x)(2+3x)+3x-(3x-4)^2 Rút gọn

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    (3-2x)(2+3x)+3x-(3x-4)^2
    = 6+9x-4x-6x^2+3x-9x^2+24x-16
    = -15x^2+32x-10

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $(3-2x)(2+3x)+3x-(3x-4)^2$
    $= 3(2+3x)-2x(2+3x)+3x-[(3x)^2-2.3x.4+4^2)$
    $= 6+9x-4x-6x^2+3x-(9x^2-24x+16)$
    $= 6+9x-4x-6x^2+3x-9x^2+24x-16$
    $= -15x^2 + 32x -10$

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