Mong đc giúp bài này ạ

Question

Mong đc giúp bài này ạ
mong-dc-giup-bai-nay-a

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Edana Edana 5 years 2021-05-21T19:17:52+00:00 2 Answers 26 views 0

Answers ( )

  1. Ben
    0
    2021-05-21T19:18:52+00:00
    Reply

    $#Dino$

    `M+N=2x²-5xy+3y²+4x²+xy-2y²`

    `=(2x²+4x²)+(-5xy+xy)+(3y²-2y²)`

    `=6x²-4xy+y²`

    ……………………….

    `M+N=2x²-5xy+3y²-4x²-xy+2y²`

    `=(2x²-4x²)+(-5xy-xy)+(3y²+2y²)`

    `=2x²-5xy+3y²-4x²-xy+2y²`

    ……………………..

    `M+N+1=2x²-5xy+3y²+4x²+xy-2y²+1`

    `=6x²-4xy+y²+1`

    …………………..

    `M-N+1=2x²-5xy+3y²-4x²-xy+2y²-1`

    `=2x²-5xy+3y²-4x²-xy+2y²-1`

     

  2. thugiang
    0
    2021-05-21T19:19:35+00:00
    Reply

    #PLPT

    Đáp án:

    a)M+N=6x²-4xy+y²

    b)M-N=-2x²+-6xy+5y²

    c)M+N+1=8x²-4xy+y²+1

    d)M-N+1=-2x²+-6xy+5y²+1

    Giải thích các bước giải:

    a)M+N

    =2x²-5xy+3y²+4x²+xy-2y²

    =(2x²+4x²)+(-5xy+xy)+(3y²-2y²)

    =6x²-4xy+y²

    b)M-N

    =(2x²-5xy+3y²)-(4x²+xy-2y²)

    =2x²-5xy+3y²-4x²-xy+2y²

    =(2x²-4x²)+(-5xy-xy)+(3y²+2y²)

    =-2x²+-6xy+5y²

    c)M+N+1

    =2x²-5xy+3y²+4x²+xy-2y²+1

    =(2x²+4x²)+(-5xy+xy)+(3y²-2y²)+1

    =8x²-4xy+y²+1

    d)M-N+1

    =(2x²-5xy+3y²)-(4x²+xy-2y²)+1

    =2x²-5xy+3y²-4x²-xy+2y²+1

    =(2x²-4x²)+(-5xy-xy)+(3y²+2y²)+1

    =-2x²+-6xy+5y²+1

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