Question

Efectuati ecuatiile : 2,5x-4,7=3(1,5x+2) ; 3x-5+4x=18 ; 8x+20=3x ; 10(x-3)=4(6x+7)-2 ; (2+rad din 3 )x-2+rad din3=0

Answer 1

a)2,5x-4,7=4,5x+6
-2x=10,7
x=-5,35
b)7x=23
x=23/7
c)5x=20
x=4
d)10x-30=24x+28-2
-14x=56
x=-4
e)$(2+ \sqrt{3})x=2- \sqrt{3}$
$x= \frac{2- \sqrt{3} }{2+ \sqrt{3} }$=$\frac{(2- \sqrt{3}) ^2 }{4-3} = \frac{4-4 \sqrt{3}+3 }{1}$=$7-4 \sqrt{3}$