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

Toán Lớp 8: . . . . . . . . . . . . . Câu 1: Làm tính nhân: a, 3x(5×2 – 2x – 1) b, (x2+2xy -3)(-xy) c, 1/2 x2y ( 2×3 – 2/5 xy2 -1)

Toán Lớp 8: .
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Câu 1: Làm tính nhân:
a, 3x(5×2 – 2x – 1)
b, (x2+2xy -3)(-xy)
c, 1/2 x2y ( 2×3 – 2/5 xy2 -1)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a)
    3x(5x^2-2x-1)
    =3x.5x^2+3x.(-2x)+3x.(-1)
    =15x^3-6x^2-3x
    b)
    (x^2+2xy-3)(-xy)
    =x^2 .(-xy)+2xy.(-xy)+(-3).(-xy)
    =-x^3y-2x^2y^2+3xy
    c)
    1/2x^2y(2x^3-2/5xy^2-1)
    =1/2x^2y.2x^3+1/2x^2y.(-2/5xy^2)+1/2x^2y.(-1)
    =x^5y-1/5x^3y^3-1/2x^2y
    #LinhSad

  2. a, 3x(5x² – 2x – 1)
    =3x.5x²-3x.2x-3x.1
    =15x³-6x²-3x
    b, (x²+2xy -3)(-xy)
    =-xy.x²-xy.2xy+xy.3
    =-xy³-2x²y²+3xy
    c, 1/2x²y ( 2x³ – 2/5 xy² -1)
    =1/2x²y.2x³-1/2x²y.2/5xy²-1/2x²y-1
    =x5y – 1/5 x3y3 – 1/2 x2y
    XIN HAY NHẤT Ạ!

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