ex 25.
a) x = -1; b) x = -3,6; c) x = -[tex]\sqrt{2}[/tex];
ex 26.
a) x + 3 = -7 x = -7 -3 x = -11 b) 2x -1 = -8,24 x - 1 = -8,24 : 2 x - 1 = -4,12 x = -4,12 + 1 x = -3,14 c) x + 1/3 = - 2/3 x = -2/3 - 1/3 x= -4/3
d) x - 2[tex]\sqrt{5}[/tex] = [tex]\sqrt{20}[/tex] x - 2[tex]\sqrt{5}[/tex] = 2[tex]\sqrt{5}[/tex] (aici am scos de sub radical pe 20) x=4[tex]\sqrt{5}[/tex]
ex 27.
a) x - 3/4 = -5 x - 3 = -5 · 4 x - 3 = -20 x = -20 +3 x= -17
b) 2x + 7/2 = 6 2x + 7 = 12 2x= 12 -7 2x= 5 x= 5 : 2 x= 2,5
c) 3x + 1/4 = -2 3x + 1 = -8 3x = -9 x= -3
