Question

Dau coroana pentru raspuns urgent cu rezolvare
10 .Rezolvati in R ecuatiile :
a) 3-4x = 6x+13
b) (x+1)·(x-1)-(x-4)²=-1
c) $\frac{x}{2} -\frac{x-2}{6} = 1$

Answer 1

a) 3-4x=6x+13
-4x-6x=13-3
-10x=10
x=-1
b) (x+1)(x-1)-(x-4)^2=-1
x^2-x+x-1-(x2-2*x*4+16)=-1 ( se reduc) => 8x=-1+1+16
x=16/8=2
c) x/2-(x-2)/6=1
(6x-2x+4)/12=12/12=>
3x=12-3
x=9/3=3