a,5.(2x-3)-4(5x-7)=19-2(x+11) b,5x+3,5+(3x-4)=7x-3(x-0,5) c,7.(4x+3)-4(x-1)=15(x+0,75)+7 d,3x-2,42+0,8x=3,38-0,2x

Question

a,5.(2x-3)-4(5x-7)=19-2(x+11)
b,5x+3,5+(3x-4)=7x-3(x-0,5)
c,7.(4x+3)-4(x-1)=15(x+0,75)+7
d,3x-2,42+0,8x=3,38-0,2x

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Camila 7 ngày 2021-12-07T22:59:41+00:00 1 Answers 2 views 0

Answers ( )

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    2021-12-07T23:00:54+00:00

    Đáp án:

    a) 5( 2x-3) – 4( 5x-7) = 19 – 2(x+11)

    ⇔    10x -15 -20x+28= 19 -2x-22

    ⇔    -10x +13 = -2x-3

    ⇒     -10x +13 + 2x+3=0

    ⇔    -8x +16=0

          ⇒x=2

    b) 5x + 3,5 +(3x-4)= 7x-3(x-0,5)

    ⇔    5x + 3,5 +3x-4 = 7x-3x+ 1,5

    ⇔    8x -0,5= 4x+ 1,5

    ⇒    8x -0,5- 4x- 1,5=0

    ⇔    4x- 2=0

        ⇒ x= 1/2

    Giải thích các bước giải:

     

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