Răspuns:
Explicație pas cu pas:
x/ (x+1)* 12=8
12x /(x+1)=8
8(x+1)=12x
8x+8=12x
12x-8x= 8
4x= 8
x= 8:4
x=2
-
(3x+1)/ ( 2x+5)*252= 20
252*( 3x+1) / (2x+5)=20 l :4.......................împartim la 4 fiecare termen
63*(3x+1) = 5( 2x+5)
189x +63= 10x+25
189x-10x= 25-63
179x= - 38
x= -38/ 179
-
x/3*(x+1)= 4
x( x+1) / 3= 4
x²+x= 4*3
x²+x= 12
x²+x-12 =0
Δ = 1+4*12=49 ...............................Δ = delta
√Δ=7
x₁= (-1-7) /2= -8/2= -4
x₂= (-1+7) /2= 6/2= 3
