Question

Rezolvati urmatoarele ecuatii in multimea nr reale :
a . 3[2+3(x-1)]=5(2x+1)
b . 2-[5(2x-1)-2x]=11x
c . 3[2(3x-1)-3(2x-3)+2x]-5(6x+5)=3[2(x+4)-115]-29x

Answer 1

a) 3(2+3x-3)=10x+5
6+9x-9=10x-5
9x-10x=-5+9-6
-x=-2
x=2

b)2-(10x-5-2x)=11x
2-(8x-5)=11x
2-8x+5=11x
-8x+7=11x
-8x-11x=-7
-19x=-7
x=$\frac{7}{19}$

c)3(6x-2-6X+9+2x)-30x-25=3(2x+8-115)-29x
3(7+2x)-30x-25=3(2x-107)-29x
21+6x-30x-25=6x-321-29x
-4-24x=-23x-321
-x=-317
x=317

Sper ca te-am ajutat, coronita? :*