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

Toán Lớp 8: Thực hiện phép tính:(x-2)(x+3)-(2x+1)(x-4)

Toán Lớp 8: Thực hiện phép tính:(x-2)(x+3)-(2x+1)(x-4)

Comments ( 2 )

  1. (x-2).(x+3) – (2x+1).(x-4)
    = [x.(x+3)- 2.(x+3)] – [2x.(x-4)+ x-4]
    = $x^{2}$ +3x -2x-6- 2$x^{2}$+ 8x- x+4
    = -$x^{2}$ +8x -2
    CHÚC BẠN HỌC TỐT.
    [hoangviet2007]  

  2. $(x-2)(x+3)-(2x+1)(x-4)$
    $=(x^2+x-6)-(2x^2-7x-4)$
    $=x^2+x-6-2x^2+7x+4$
    $=-x^2+8x-2$

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

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