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Er dette rett???? 1/3x – (x+1/2) – 3x/5 + x/2 * (-5) >3x/
Posted: 27/11-2008 19:50
by onkelskrue
1/3x – (x+1/2) – 3x/5 + x/2 * (-5) >3x/2
x/3-x/1-1/2-3x/5-5x/2+3x/2>0
x/3-x/1-3x/5-5x/2+3x/2>1/2
(10x-30x-18x-75+45) /(30) >1/2
-68x/30 >1/2
x<-15/68
Posted: 27/11-2008 20:14
by onkelskrue
Dette er kanskje litte mere riktig???
1/3x – (x+1/2) – 3x/5 + x/2 * (-5) >3x/2
x/3-x/1-1/2-3x/5-5x/2+3x/2>0
x/3-x/1-3x/5-5x/2+3x/2>1/2
(10x-30x-18x-75x-45x) /(30) >1/2
-158x/30 >1/2
-158x>15
x<-15/158
Posted: 27/11-2008 20:31
by kimla
onkelskrue wrote:Dette er kanskje litte mere riktig???
1/3x – (x+1/2) – 3x/5 + x/2 * (-5) >3x/2
x/3-x/1-1/2-3x/5-5x/2+3x/2>0
x/3-x/1-3x/5-5x/2+3x/2>1/2
(10x-30x-18x-75x-45x) /(30) >1/2
-158x/30 >1/2
-158x>15
x<-15/158
Her bommer du vel når du flytter over 3x/2, du glemmer å bytte fortegn?