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

Toán Lớp 8: a) $24x^{3}$ – 64 b) $x^{2}$ + 4x + 4 c) $x^{2}$ – 2x + 1 d) $49^{2}$ – 25

Toán Lớp 8: a) $24x^{3}$ – 64
b) $x^{2}$ + 4x + 4
c) $x^{2}$ – 2x + 1
d) $49^{2}$ – 25

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a, \ 24x^3-64=8.3x^3-8.8=8.(3x^3-8) 
    b, \ x^2+4x+4=x^2+2.x.2+2^2
    =(x+2)^2
    C_2 : \ x^2+4x+4=x^2+2x+2x+4
    =x(x+2)+2(x+2)=(x+2)(x+2)
    =(x+2)^2
    c, \ x^2-2x+1=x^2-2.x.1+1^2
    =(x-1)^2
    C_2 : \ x^2-2x+1=x^2-x-x+1
    =x(x-1)-(x-1)=(x-1)(x-1)
    =(x-1)^2
    d, \ 49x^2-25=(7x)^2-5^2
    =(7x-5)(7x+5)

  2. a)24x³-64
    =8.3x³-8²
    =8.(3x-8)
    b)x²+4x+4
    =(x+2)²
    c)x²-2x+1
    =(x-1)²
    d)49x²-25
    =(7x)²-5²
    =(7x-5).(x+5)
    gửi tus nha ~
    $#chúc cậu học tốt$

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