Question

1)Determinati multimea solutiilor ecuatiilor urmatoare in multimile Ζ,respectiv Q. a )2,1x-7=0 b)-3 pe 2 x-2=0 c)2,(5)x=0 d)-4,5-x=1,5 e)(1 pe6-1pe7)x=1 pe 6 ori 7 f) -1 pe 20x -1pe4=-1pe5x g) -2pe 3x-1pe3=-1pe3x

Marchez ca cel mai bun cine am ajuta si pe minee...:( Va roooggg

Answer 1

a)2,1x-7=0
21x/10=7
x=7·10/21
x=3,(3)
b)-3/2·x-2=0
-3x/2=2   (-1)
x=-2·2/3
x=-1,(3)
c)2,(5)x=0
c=0
d)-4,5-x=1,5
-x=1,5+4,5
-x=6     (-1)
x=-6
e)(1/6-1/7)·x=1/6·7
(7-6)42·x=7/6
x/42=7/6
6x=7·42
x=7·42/6
x=49
f)(-1/20)·x-1/4=1/5·x
-x/20-x/5=1/4
(-x-4x)/20=1/4
-5x/20=1/4
-20x=20    (-1)
x=-20/20
x=-1
g)-2/3·x-1/3=-1/3·x
-2x/3+x/3=1/3
-x/3=1/3
-x=1    (-1)
x=-1