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

Toán Lớp 8: A)(2x+2)² B)(5x-4)² C)(4x²+3y)(4x²-3y) D)x2+6x+9 E)25x²-10xy+y² F)(2/3x+5y)²

Toán Lớp 8: A)(2x+2)²
B)(5x-4)²
C)(4x²+3y)(4x²-3y)
D)x2+6x+9
E)25x²-10xy+y²
F)(2/3x+5y)²

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     a, $(2x+2)^{2}$ =4$x^{2}$ +4x+4
    b,$(5x-4)^{2}$ =25$x^{2}$ -40x+16
    c,$(4x^{2}+3y)(4x^{2}$ -3y)=16$x^{4}$ -9$y^{2}$ 
    d,$x^{2}$ +6x+9=$(x+3)^{2}$ 
    e,25$x^{2}$ -10xy+$y^{2}$ =$(5x-y)^{2}$ 
    f,$(2/3x+5y)^{2}$ =$\frac{4}{25}$ $x^{2}$ + $\frac{20}{3}$x+25 $y^{2}$ 

  2. a, (2x + 2)^2
    = 2x(2x + 2) + 2(2x + 2)
    = 4x^2 + 4x + 4x + 4
    = 4x^2 8x + 4
    b, (5x – 4)^2
    = 5x(5x – 4) – 4(5x – 4)
    = 25x^2 – 20x – 4(5x – 4)
    = 25x^2 – 40x – 16
    c. (4x^2 + 3y)(4x^2 – 3y)
    = 4(4x^2 – 3y)x^2+3y(4x^2-3y)
    = 16x^4 – 12yx^2 + 12yx^2 – 9y^2
    = 16x^4 – 9y^2

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