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

Toán Lớp 8: Hiệu hai bình phương A , 1/2^2 – 3/2y^2 B , 3/4x^2 y^2 – 4y^4

Toán Lớp 8: Hiệu hai bình phương
A , 1/2^2 – 3/2y^2
B , 3/4x^2 y^2 – 4y^4

Comments ( 1 )

  1. $a)\dfrac{1}{2}x^2-\dfrac{3}{2}y^2$
    $=\dfrac{1}{2}(x^2-3y^2)$
    $=\dfrac{1}{2}(x-\sqrt[]{3}y)(x+\sqrt[]{3}y)$
    $b)\dfrac{3}{4}x^2y^2-4y^4$
    $=\dfrac{1}{4}(3x^2y^2-16y^4)$
    $=\dfrac{1}{4}(\sqrt[]{3}xy-4y^2)(\sqrt[]{3}xy+4y^2)$

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

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