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

Toán Lớp 8: Rút gọn ” Nhân Đa thức vs đa thức ” 7/ (x + 2)(6 – x) – (3x – 1)(1 + 3x) 8/ 23×2 + (3x + 5)(1 – x2 + 4x) Giup e 2 bài e cảm ơn tick 5

Toán Lớp 8: Rút gọn ” Nhân Đa thức vs đa thức ”
7/ (x + 2)(6 – x) – (3x – 1)(1 + 3x)
8/ 23×2 + (3x + 5)(1 – x2 + 4x)
Giup e 2 bài e cảm ơn tick 5* CTLHN

Comments ( 2 )

  1. 7// (x+2)(6-x)-(3x-1)(1+3x)
    =6x-x^2+12-2x-3x-9x^2+1+3x
    =(6x-2x-3x+3x)-(x^2+9x^2)+12+1
    =4x-10x^2+13
    __
    8// 23x^2+(3x+5)(1-x^2+4x)
    =23x^2+3x-3x^3+12x^2+5-5x^2+20x
    =(23x^2+12x^2-5x^2)+(3x+20x)-3x^3+5
    =30x^2+23x-3x^3+5

  2. a) (x+2)(6-x)-(3x-1)(1+3x)
    =6x-x^2+12-2x-9x^2+1
    =-10x^2-4x+13
    Áp dụng: A^2-B^2=(A-B)(A+B)
    b) 23x^2+(3x+5)(1-x^2+4x)
    =23x^2+3x-3x^3+12x^2+5-5x^2+20x
    =-3x^3+30x^2+23x+5
     

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

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