(2x+y)² .(2x-y)² Rut gon lop 8

Question

(2x+y)² .(2x-y)²
Rut gon lop 8
2-y-2-y-rut-gon-lop-8

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Verity 4 years 2020-11-19T04:06:28+00:00 1 Answers 72 views 0

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  1. minhkhang
    0
    2020-11-19T04:07:46+00:00
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    Đáp án:

    \(E = {\left( {6x + 2} \right)^2}\)

    Giải thích các bước giải:

    \(\begin{array}{l}
    A = {\left[ {\left( {2x + y} \right)\left( {2x – y} \right)} \right]^2}\\
     = {\left( {4{x^2} – {y^2}} \right)^2}\\
    C = {x^2} – 2xy + {y^2} + 4xy\\
     = {x^2} + 2xy + {y^2}\\
     = {\left( {x + y} \right)^2}\\
    E = {\left[ {5\left( {x + 1} \right)} \right]^2} + 2.5\left( {x + 1} \right)\left( {x – 3} \right) + {\left( {x – 3} \right)^2}\\
     = {\left[ {5\left( {x + 1} \right) + \left( {x – 3} \right)} \right]^2}\\
     = {\left( {5x + 5 + x – 3} \right)^2}\\
     = {\left( {6x + 2} \right)^2}
    \end{array}\)

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