???????????????????????????????????????? Lm ơn đó help me. Hứa vote 5*, CTLHN

???????????????????????????????????????? Lm ơn đó help me. Hứa vote 5*, CTLHN
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  1. Đáp án:

     $a) 25a^2 +10a+1$

    $ = (5a+1)^2$

    $= (5a+1)(5a+1)$

    $b) 10ab + 0,25a^2 +100b^2$

    $ = 0,25a^2 + 2. 0,5a .10b +100b^2$

    $=  (0,5a +10b)^2$

    $ = (0,5a+10b)(0,5a+10b)$

    $c) 9x^2-24x+16y^2$

    $ = (3x -4y)^2$

    $= (3x-4y)(3x-4y)$

    $d) 9x^2-xy+\dfrac{1}{36}y^2$

    $ = (3x – \dfrac{1}{6}y)^2$

    $ = (3x-\dfrac{1}{6}y)(3x-\dfrac{1}{6}y)$

     

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  2. a) `25a^2 + 10a + 1`

    `=(5a)^2 + 2.5a + 1^2`

    `=(5a+1)^2` 

    b) `10ab + 0,25a^2 +100b^2`

    `=(0,5a)^2 + 2.0,5.10ab + (10b)^2`

    `=(0,5a+10b)^2`

    c) `9x^2 – 24xy + 16y^2`

    `=(3x)^2 – 2.3x.4y + (4y)^2`

    `=(3x-4y)^2`

    d) `9x^2 – xy + 1/36 y^2`

    `=(3x)^2 – 2.3x. 1/6. y + (1/6y)^2`

    `=(3x-1/6y)^2`

    End.

    Reply

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