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

Toán Lớp 8: a/(-1/2x^2y+3xy+1)(-3x+4) b/(9x-7y)(3x+4y)

Home/ Toán Lớp 8: a/(-1/2x^2y+3xy+1)(-3x+4) b/(9x-7y)(3x+4y)

Toán Lớp 8: a/(-1/2x^2y+3xy+1)(-3x+4) b/(9x-7y)(3x+4y)

Tháng Tám 18, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: a/(-1/2x^2y+3xy+1)(-3x+4)
b/(9x-7y)(3x+4y)

Comments ( 1 )

  1. diepbich93
    diepbich93
    18 Tháng Tám, 2022 at 8:06 sáng
    Reply
    a) (-1/2x^2y+3xy+1)(-3x+4)
    =-1/2x^2y.-3x-1/2x^2y.4+3xy.-3x+3xy.4+1.-3x+1.4
    =3/2x^3y-2x^2y-9x^2y+12xy-3x+4
    =3/2x^3y-11x^2y+12xy-3x+4
    b) (9x-7y)(3x+4y)
    =9x.3x+9x.4y-7y.3x-7y.4y
    =27x^2+36xy-21xy-28y^2
    =27^2+15xy-28y^2

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

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