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

Toán Lớp 8: a)2x^2 + 4x – 6 b)10x^2 + 4x – 6 c)2x^2 + 3x – 5 d)2x^2 + x – 6 e)x^2 – x – 6 giúp em với ạ

Tháng Mười 18, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a)2x^2 + 4x – 6
b)10x^2 + 4x – 6
c)2x^2 + 3x – 5
d)2x^2 + x – 6
e)x^2 – x – 6
giúp em với ạ

Comments ( 2 )

  1. mytamhoang
    mytamhoang
    18 Tháng Mười, 2022 at 9:58 sáng
    Reply
    a) 2x^2 + 4x – 6
    =2(x^2+2x-3)
    =2(x^2+3x-x-3)
    =2(x×(x+3)-x-3)
    =2(x+3)xx(x-1)
    b) 10x^2 + 4x – 6
    =2(5x^2+2x-3)
    =2(5x^2+5x-3x-3)
    =2(5x×(x+1)-3x-3)
    =2(5x×(x+1)-3(x+1))
    =2(x+1)xx(5x-3)
    c) 2x^2 + 3x – 5
    =2x^2+5x-2x-5
    =x×(2x+5)-2x-5
    =x×(2x+5)-(2x+5)
    =(2x+5)xx(x-1)
    d) 2x^2 + x – 6
    =2x^2+4x-3x-6
    =2x×(x+2)-3x-6
    =2x×(x+2)-3(x+2)
    =(x+2)xx(2x-3)
    e) x^2 – x – 6
    =x^2+2x-3x-6
    =x×(x+2)-3x-6
    =x×(x+2)-3(x+2)
    =(x+2)xx(x-3)

  2. thanhmaianh
    thanhmaianh
    18 Tháng Mười, 2022 at 9:57 sáng
    Reply
    Lời giải và giải thích chi tiết:
    a)
    2x^2 + 4x – 6
    = 2x^2 – 2x + 6x – 6
    = 2x(x – 1) + 6(x – 1)
    = (2x + 6)(x – 1)
    = 2(x + 3)(x – 1)
    b)
    10x^2 + 4x – 6
    = 10x^2 + 10x – 6x – 6
    = 10x(x + 1) – 6(x + 1)
    = (10x – 6)(x + 1)
    = 2(5x – 3)(x + 1)
    c)
    2x^2 + 3x – 5
    = 2x^2 – 2x + 5x – 5
    = 2x(x – 1) + 5(x – 1)
    = (2x + 5)(x – 1)
    d)
    2x^2 + x – 6
    = 2x^2 – 3x + 4x – 6
    = x(2x – 3) + 2(2x – 3)
    = (x + 2)(2x – 3)
    e)
    x^2 – x – 6
    = x^2 + 2x – 3x – 6
    = x(x + 2) – 3(x + 2)
    = (x – 3)(x + 2)

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

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