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

Toán Lớp 8: 1)(X+y+z)(x-y+z) 2)(2x^2-3x+5)(x^2-8x+2)

Home/ Toán Lớp 8: 1)(X+y+z)(x-y+z) 2)(2x^2-3x+5)(x^2-8x+2)

Toán Lớp 8: 1)(X+y+z)(x-y+z) 2)(2x^2-3x+5)(x^2-8x+2)

Tháng Mười Hai 28, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 1)(X+y+z)(x-y+z)
2)(2x^2-3x+5)(x^2-8x+2)

Comments ( 1 )

  1. truongthanhhung
    truongthanhhung
    28 Tháng Mười Hai, 2022 at 9:12 chiều
    Reply
    1) (x + y + z)(x – y + z)
    = x^2 – xy + xz – y^2 + yz + z^2
    2) (2x^2 – 3x + 5)(x^2 – 8x + 2)
    = 2x^4 – 16x^3 + 4x^2 – 3x^3 + 24x^2 – 6x + 5x^2 – 40x + 10
    = 2x^4 + (-3x^3 – 16x^3) + (24x^2 + 4x^2 + 5x^2) + (-40x – 6x) + 10
    = 2x^4 – 19x^3 + 33x^2 – 46x + 10        

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

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