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

Toán Lớp 8: kết quả phép tính (x+1)^2+(x-2)(x+3)-4x là

Toán Lớp 8: kết quả phép tính (x+1)^2+(x-2)(x+3)-4x là

Comments ( 2 )

  1. (x + 1)^{2} + (x – 2)(x + 3) – 4x
    = x^{2} + 2x + 1 + x^{2} + 3x – 2x – 6 – 4x
    = 2x^{2} – x – 5
     

  2. (x+1)^2+(x-2)(x+3)-4x
    =x^2+2x+1+x^2+3x-2x-6-4x
    =2x^2-x-5
     

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

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