3.Rezolvati in R ecuatia
a) x-2/5 - x+1/2 =3
b) x+1/2-x-2/3=3
4)Rezolvati in R ecuatia
a) (x-3)la puterea 2 +7= 2x+(x+4)la puterea 2
b)(x-3)la puterea 2 +2 (x+5)(x-5) =3(x+1) la puterea 2 +4
c)1+x(x-1)=(x-2)la puterea 2
d) 12-2(x-1) la puterea 2 = 4(x-2)-(x-3)(2x-5)
4) a)2x la a 2 -6x+9+7=2x+2x la a 2 +8x+16=2x la a 2 - 2x la a 2 +6x+2x=9+7+16 8x=32 x=32÷8 x=4 b)2x la a 2 -6x+9+2×x la a 2 +25=3x+1 2x la a 2 -2x la a 2 -6x+3x=25+1 2x=26 x=26÷2 x=13
