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

Toán Lớp 8: a)15xy²-20xy b) 2x²-4x+3xy-6y c) 2x²-5x-12

Tháng Tư 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a)15xy²-20xy
b) 2x²-4x+3xy-6y
c) 2x²-5x-12

Comments ( 2 )

  1. annhocbichchaubich
    annhocbichchaubich
    2 Tháng Tư, 2022 at 10:43 sáng
    Reply
    a)15xy²-20xy
    = 5xy ( 3y – 4 )
    b) 2x²-4x+3xy-6y
    = (2x²-4x)+(3xy-6y)
    = 2x ( x-2) + 3y ( x-2)
    = ( x-2) (2x+3y)
    c) 2x²-5x-12
    =  2x² +3x -8x -12
    =  x(2x+3) -4 (2x+3)
    = ( 2x+3) (x-4)

  2. lanthuhoa
    lanthuhoa
    2 Tháng Tư, 2022 at 10:43 sáng
    Reply
    Giải đáp:
    a, 15xy^2 – 20xy
    = 5xy(3y – 4)
    b, 2x^2 – 4x + 3xy – 6y
    = 2x(x-2) + 3y(x-2)
    = (x-2)(2y+3y)
    c, 2x^2 – 5x – 12
    = 2x^2 + 3x – 8x – 12
    = x(2x+3) – 4(2x+3)
    =(2x+3)(x-4)
     

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

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