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

Toán Lớp 8: a. 2x(3x-2y²+1/4) b. (3x-2)(3x²-2x+1) c. (2x-3)² e. (2x+4)(2x-4) Cần gấp, giúp mình với

Toán Lớp 8: a. 2x(3x-2y²+1/4)
b. (3x-2)(3x²-2x+1)
c. (2x-3)²
e. (2x+4)(2x-4)
Cần gấp, giúp mình với

Comments ( 2 )

  1. a)2x(3x-2y^2+1/4)
    =6x^2-4xy^2+1/2x
    b)(3x-2)(3x^2-2x+1)
    =9x^3-6x^2+3x-6x^2+4x-2
    =9x^3-12x^2+7x-2
    b)(2x-3)^2
    =4x^2-12x+9
    c)(2x+4)(2x-4)
    =(2x)^2-4^2
    =4x^2-16

  2. Giải đáp + Lời giải và giải thích chi tiết:
    $\text{a) 2x.(3x – $2y^{2}$ + $\dfrac{1}{4}$)}$
    $\text{= $6x^{2}$ – $4xy^{2}$ + $\dfrac{1}{2}$x }$
    $\text{b) (3x – 2)($3x^{2}$ – 2x + 1)}$
    $\text{= $9x^{3}$ – $6x^{2}$ + 3x – $6x^{2}$ + 4x – 2}$
    $\text{= $9x^{3}$ – $12x^{2}$ + 7x – 2}$
    $\text{c) $(2x – 3)^{2}$}$
    $\text{= $(2x)^{2}$ – 2.2x.3 + $3^{2}$}$
    $\text{= $4x^{2}$ – 12x + 9}$
    $\text{d) (2x + 4).(2x – 4)}$
    $\text{= $4x^{2}$ – 16}$
    Học Tốt <3 
    $\text{#SunHee}$

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

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