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

Toán Lớp 8: giúp mik với ạ Phân tích các đa thức sau thành nhân tử a)(x-3)(x-1)-3(x-3) b)(x-1)(2x+1)+3(x-1)(x+2)(2x+1) c)(6x+3)-(2x-5)(2x+1) d)(x-5

Toán Lớp 8: giúp mik với ạ
Phân tích các đa thức sau thành nhân tử
a)(x-3)(x-1)-3(x-3)
b)(x-1)(2x+1)+3(x-1)(x+2)(2x+1)
c)(6x+3)-(2x-5)(2x+1)
d)(x-5)^2+(x+5)(x-5)-(5-x)(2x+1)
e)(3x-2)(4x-3)-(2-3x)(x-1)-2(3x-2)(x+1)

Comments ( 2 )

  1. Lời giải và giải thích chi tiết + Giải đáp :
    a) (x-3)(x-1)-3(x-3)
    =(x-3)(x-1-3) = (x-3)(x-4).
    b)(x-1)(2x+1)+3(x-1)(x+2)(2x+1)
    = (x-1)(2x+1)[1+3(x+2)]
    = (x-1)(2x+1)(3x+7).
    c)(6x+3)-(2x-5)(2x+1)
    = 3(2x+1)-(2x-5)(2x+1)
    = (2x+1)(3-2x+5)=(2x+1)(8-2x)
    = (2x+1)2(4-x).
    d)(x-5)^2+(x+5)(x-5)-(5-x)(2x+1)
    = (x-5)(x+5)+(x+5)(x-5)+(x-5)(2x+1)
    = 2(x-5)(x+5)+(x-5)(2x+1)
    (x-5)[2(x+5)+2x+1]
    = (x-5)(2x+10+2x+1)
    = (x-5)(4x+11).
    e)(3x-2)(4x-3)-(2-3x)(x-1)-2(3x-2)(x+1)
    = (3x-2)(4x-3)+(3x-2)(x-1)-(3x-2)(2x+2)
    = (3x-2)(4x-3+x-1-2x-2)
    = (3x-2)(3x-7).
    @tgnak435.
    #ChúcBạnHọcTốt.
     

  2. @Oops
    a)
    (x-3)(x-1)-3(x-3)
    =(x-3)(ax-a-3)
    b)
    (x-1)(2x+1)+3(x-1)(x+2)(2x+1)
    =(x-1)(2x+1)(3x+b+6)
    c)
    (6x+3)-(2x-5)(2x+1)
    =2x.3+3-(2x-5)(2x+1)
    = 2x(3-1+1)+(3-5+1)
    =2x(3-1+1)-1
    d)
    (x-5)²+(x+5)(x-5)-(5-x)(2x+1)
    =x²-2.x.5+5²+x²-5x+5x-5²-10x-5-2x²-x
    =(x²+x²-2x²)+(-10x-5x+5x-10x-x)+(5²-5²-5)
    =-20x-5
    =-5.4x-5
    =-5(4x-1)
    e)
    (3x-2)(4x-3)-(2-3x)(x-1)-2(3x-2)(x+1)
    =12x²-9x-8x+6-2x-x-3x+3x-(6x+4)(x+1)
    =12x²-9x-8x+6-2x-x-3x+3x-6x²-6x+4x+1
    =(12x²-6x²)+(-9x-8x-2x-x-3x+3x-6x+4x)+(6+1)
    =6x²-22x+7

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

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