Question

Help la matematicã.
totul...

Answer 1

3)
a)2x-7=11 => 2x=18 => x=9
x-8=0 => x=8
b)(x-1)(x+2)=0 => x=1; x=-2
x+2=0 => x= -2
4)
a)2x-5=7 => 2x=14 => x=7
d)7x-5=5x+19 =>2x=24 => x=12
b)131+3y=11 => 3y=−120 => y= -40
e)4z-9=z+7 => 3z=16 => z=16/3
c)7t+18=9t => −2t=−18 => t=9
f)2(x-1)+5=2x+3 => 2x+3=2x+3 => x paote lua orice valoare din Z

Answer 2

2x-5=7      7x-5=5x+19
2x=12       7x=5x+19+5
x=12:2      2x=24
x=6           x=24:2
                 x=12

131+3y=11 Asta e gresita
4z-9=z+7
4z=z+7+9
4z=z+16
3z=16
z=16:3
z=5 rest 1
   
  7t+18=9t    2(x-1)+5=2x+3
  9t-7t=18     2(x-1)+2=2x
  2t=18         2x-2+2=2x
  t=9             2x=2x
 Coroana Plz