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

Toán Lớp 8: a) ( x + 15 )^2 – 4x^2 b) 1 x^3 – 27 8 c) ( 3x + 2 )^2 – ( x – 1 )^2 d) ( xy + 1 )^2 – ( 1 + x )^2 e) 6x^2 – 2x – 8 g) 8x^3y + 16xy

Home/ Toán Lớp 8: a) ( x + 15 )^2 – 4x^2 b) 1 x^3 – 27 8 c) ( 3x + 2 )^2 – ( x – 1 )^2 d) ( xy + 1 )^2 – ( 1 + x )^2 e) 6x^2 – 2x – 8 g) 8x^3y + 16xy

Toán Lớp 8: a) ( x + 15 )^2 – 4x^2 b) 1 x^3 – 27 8 c) ( 3x + 2 )^2 – ( x – 1 )^2 d) ( xy + 1 )^2 – ( 1 + x )^2 e) 6x^2 – 2x – 8 g) 8x^3y + 16xy

Tháng Một 23, 2023 Toán học 2 Comments 0 views

Toán Lớp 8: a) ( x + 15 )^2 – 4x^2
b) 1 x^3 – 27
8
c) ( 3x + 2 )^2 – ( x – 1 )^2
d)
( xy + 1 )^2 – ( 1 + x )^2
e) 6x^2 – 2x – 8
g) 8x^3y + 16xy^2 + 12x^2y^2

Comments ( 2 )

  1. thanhmaianh
    thanhmaianh
    23 Tháng Một, 2023 at 4:41 sáng
    Reply
    a) ( x + 15 )^2 – 4x^2
    = (x + 15 – 4)(x + 15 + 4)
    = (x + 11)(x + 19)
    b) 1 x^3 – 27
    = x^3 – 3^3
    = (x – 3)(x^2 + 3x +9)
    c) ( 3x + 2 )^2 – ( x – 1 )^2
    = (3x + 2 + x -1)(3x + 2 – x + 1)
    = (4x + 1)(2x + 3)
    d) ( xy + 1 )^2 – ( 1 + x )^2
    = (xy + 1 -1 – x)(xy + 1 + 1 + x)
    $= (xy – x)(xy + x + 2)$
    = x. (y – 1)(xy + x + 2)
    e) 6x^2 – 2x – 8
    =6x^2 + 6x − 8x − 8
    =6x.(x+1) – 8.(x+1)
    =(6x−8). (x+1)
    =2. (3x−4). (x+1)
    g) 8x^3y + 16xy^2 + 12x^2y^2
    $= 4xy . (2x^2+4y+3xy)$
    CHÚC BẠN HỌC TỐT!
    Cho mk xin ctlhn nha! Thanks nhìu!

  2. maianh67
    maianh67
    23 Tháng Một, 2023 at 4:41 sáng
    Reply
    Giải đáp + Lời giải và giải thích chi tiết:
    a) (x+15)^2-4x^2
    =(x+15)^2-(2x)^2
    =(x+15-2x).(x+15+2x)
    =(15-x).(3x+15)
    b) 1/8x^3-27
    =(1/2x)^3-3^3
    =(1/2x-3).(1/4x+3/2x+9)
    c) (3x+2)^2-(x-1)^2
    =(3x+2-x+1).(3x+2+x-1)
    =(2x+3).(4x+1)
    d) (xy+1)^2-(1+x)^2
    =(xy+1-1-x).(xy+1+1+x)
    =(xy-x).(xy+x+2)
    =x.(xy-1).(xy+x+2)
    e) 6x^2-2x-8
    =6x^2+6x-8x-8
    =6x.(x+1)-8.(x+1)
    =(6x-8).(x+1)
    =2.(3x-4).(x+1)
    f) 8x^3y+16xy^2+12x^2y^2
    =4xy(2x^2+4y+3xy)

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

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