a) 16x mũ 2 -24xy+9y mũ 2 b) 2ab – b mũ 2 + 49-a mũ 2

Question

a) 16x mũ 2 -24xy+9y mũ 2
b) 2ab – b mũ 2 + 49-a mũ 2

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Sigridomena 4 years 2020-10-29T13:32:18+00:00 1 Answers 99 views 0

Answers ( )

  1. quangkhai
    0
    2020-10-29T13:33:24+00:00
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    a) `16x^2 – 24xy + 9y^2 = (4x)^2 – 2.4x.3y + (3y)^2 = (4x-3y)^2`

    b) `2ab-b^2+49-a^2 = 49 – (a^2-2ab+b^2)`

    `= 7^2 – (a-b)^2 = (7+a-b)(7-a-b)`

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )