a.3+|2x-1|=2 b.11-(15+11-2x)=x-(25-9) c.-3x-12=(-9)-(-15+2x) d.2-x=15-(-5+2x)

0 bình luận về “a.3+|2x-1|=2 b.11-(15+11-2x)=x-(25-9) c.-3x-12=(-9)-(-15+2x) d.2-x=15-(-5+2x)”

1. a. `3 + |2x – 1 |` `=` `2`

   `⇔` `| 2x – 1 | = -1`

   `⇔` `x=⦰`

   b. `11 – ( 15 + 11 – 2x) = x – ( 25 – 9 )`

   `⇔` `11 – (15 + 11 – 2x) = x-16`

   `⇔` `11 – (26 – 2x) = x – 16`

   `⇔` `11-26+2x` `=` `x-16`

   `⇔` `-15+2x` `=` `x-16`

   `⇔` `-15+16` `=` `x-2x`

   `⇔` `1` `=` `-x`

   `⇔` `x` `=` `-1`

   c. `-3x-12 = (-9)-(-15+2x)`

   `⇔` `-3x-12 = (-9)+15-2x`

   `⇔` `-3x-12 = 6-2x`

   `⇔` `-3x+2x = 6+12`

   `⇔` `x = 18`

   d. `2 – x = 15 – (-5 + 2x)`

   `⇔` `2-x = 15-5-2x`

   `⇔` `2-x = 10-2x`

   `⇔` `2-10 = x-2x`

   `⇔` `-8 = x`

   `⇔` `x = -8`

   Bình luận