|x+2/3| =1/2-(1/4-2/3) |x-1/5|=|-5/2|-(1/4-2/3)

0 bình luận về “|x+2/3| =1/2-(1/4-2/3) |x-1/5|=|-5/2|-(1/4-2/3)”

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

   ⇒`|x+2/3|=1/2-1/4+2/3=11/12`

   ⇒`x+2/3=11/12` hoặc `x+2/3=-11/12`

   ⇒`x=1/4` hoặc `x=-19/12`

   b) `|x-1/5|=|-5/2|-(1/4-2/3)`

   ⇒`|x-1/5|=5/2-1/3+2/3=17/6`

   ⇒`x-1/5=17/6` hoặc `x-1/5=-17/6`

   ⇒`x=91/30` hoặc `x=-69/80`

    

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2. |x+2/3|=1/2-(1/4-2/3)

   |x+2/3|=1/2-(-5/12)

   |x+2/3|=11/12

   TH1:x+2/3=11/12⇒x=11/12-2/3⇒x=1/4

   TH2:x+2/3=-11/12⇒x=-11/12-2/3⇒x=-19/12

   |x-1/5|=|-5/2|-(1/4-2/3)

   |x-1/5|=5/2-(-5/12)

   |x-1/5|=5/2-35/12

   |x-1/5|=35/12

   TH1: x-1/5=35/12⇒x=35/12+1/5⇒x=187/60

   TH2: x-1/5=-35/12⇒x=-35/12+1/5⇒x=-163/60

    

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