-2( x -1) + 3( 2 -x ) = 4( x +2 ) 3 ( -x +2 ) – 3 ( 2-x ) = -1 . ( x+3 ) -2 ( 2 – x ) -3 (1 +x ) = 4 ( 2-3x)

0 bình luận về “-2( x -1) + 3( 2 -x ) = 4( x +2 ) 3 ( -x +2 ) – 3 ( 2-x ) = -1 . ( x+3 ) -2 ( 2 – x ) -3 (1 +x ) = 4 ( 2-3x)”

1. `#Xray`

    `a)-2(x-1)+3(2-x)=4(x+2)`

   `⇒-2x+2+6-3x=4x+8`

   `⇒-2x-3x-4x=-2-6+8`

   `⇒-9x=0`

   `⇒x=0`

   `b)3(-x+2)-3(2-x)=-1(x+3)`

   `⇒-3x+6-6+3x=-x-3`

   `⇒-3x+3x+x=-6+6-3`

   `⇒x=-3`

   `c)-2(2-x)-3(1+x)=4(2-3x)`

   `⇒-4+2x-3-3x=8-12x`

   `⇒2x-3x+12x=4+3+8`

   `⇒11x=15`

   `⇒x=15/11`

    

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2. `1)-2(x-1)+3(2-x)=4(x+2)`

   `⇔-2x+2+6 -3x=4x+8`

   `⇔-5x+8=-4x+8`

   `⇔-5x-4x=-8+8`

   `⇔-9x=0`

   `⇔x=0`

   `->` Vậy `S={0}`

   `2) 3(-x+2)-3(2-x)=-1(x+3)`

   `⇔-3x+6-6+3x=-x-3`

   `⇔0=-x-3`

   `⇔x=0+(-3)`

   `⇔x=-3`

   `->` Vậy `S={-3}`

   `3) -2(2-x)-3(1+x)=4(2-3x)`

   `⇔-4+2x-3-3x=8-12x`

   `⇔-7-x=8-12x`

   `⇔-x+12x=8+7`

   `⇔11x=15`

   `⇔x=15:11`

   `⇔x=15/11`

   `->` Vậy `S={15/11}`

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