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

Toán Lớp 8: a,4x ³-8x ²y+4xy b,x ²-4y ²-2x+4y c,9x ²-4-y ²+4y

Tháng Chín 11, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a,4x ³-8x ²y+4xy
b,x ²-4y ²-2x+4y
c,9x ²-4-y ²+4y

Comments ( 2 )

  1. maitrucloan
    maitrucloan
    11 Tháng Chín, 2022 at 3:37 chiều
    Reply
    Giải đáp:
    $a) 4x³y-8x²y+4xy$
    $= 4xy.x²-4xy.2x+4xy.1$
    $= 4xy.(x²-2x+1)$
    $=4xy.(x-1)^2$
    $b) x²-4y²-2x+4y$
    $= (x²-4y²)-(2x-4y)$
    $= [x²-(2y)²]-2.(x-2y)$
    $= (x-2y).(x+2y)-2.(x-2y)$
    $= (x-2y).(x+2y-2)$
    $c) 9x²-4-y²+4y$
    $= 9x²-(4-4y+y²)$
    $= (3x)²-(2-y)²$
    $=  (3x-2-y).(3x+2-y)$
     

  2. tuyetanhthu
    tuyetanhthu
    11 Tháng Chín, 2022 at 3:36 chiều
    Reply
    Giải đáp:
    a,4x^3y-8x^2y+4xy
    =4xy(x^2-2x+1)
    =4xy(x-1)^2
    b)x^2-4y^2-2x+4y
    =(x^2-4y^2)-(2x-4y)
    =(x-2y)(x+2y)-2(x-2y)
    =(x-2y)(x+2y-2)
    c)9x^2-4-y^2+4y
    =9x^2-(4-4y+y^2)
    =(3x)^2-(2+y)^2
    =(3x-2-y)(3x+2-y)
     

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

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