Răspunsuri

2014-06-10T15:54:25+03:00
1.a)8x+3=5x-12
8x-5x=-12-3
3x=-15
x=-5
b)23 x^{2} +2 x^{2} =16+9
25 x^{2} =25
x=1
x=-1
c)x(3-y)=11
3-y=11/3
-y=11/3-3
-y=2/3
y=-2/3
la c cum ti-a dat 2\3?
e -2\3
pai de la 3-y=11\3 cand duci pe 3 in partea cealalata vine 11\3-3 ampiuficipe 3 cu 3 si da 9 apoi 11-9=2 rezulta -y =2\3 rezulta y=-2\3
multumesc
cu placere!