Hệ pt 3x+2y=36 (x-2)(y-3)=18

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Hệ pt 3x+2y=36
(x-2)(y-3)=18

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Piper 1 năm 2021-11-21T07:39:08+00:00 1 Answers 2 views 0

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  1. diemmy
    0
    2021-11-21T07:40:21+00:00
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    ⇔3x+2y=36; xy-2y-3x+6=18

    ⇔3x+2y=36; xy-36+6=18 (3x+2y=36)

    ⇔3x+2y=36 ; xy=48

    ⇔3x+2y=36; x=48/y

    ⇔144/y+2y=36; x=48/y

    ⇔2y^2-36y+144=0; x=48/y

    ⇔y=12 hoặc y=6 ; x=48/y

    ⇔ (x;y)= (4;12) và (8;6)

     

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