Question

Bună !
rezolvati in Q ecuatiile
a)4/5x+3/10 =0
b) 3/4-9/2x=0
c) -2/3x+0,2=0
d) -0,01x-0,1=0
e) -14/5-1,5x=0
f)4x-0,4=0
ofer coronita, va multumesc

Answer 1

a) 4/5 x +3/ 10= 0
Amplificăm pentru a aduce la același numitor:
8/10 x +3/10= 0/10
Eliminăm numitorul:
8x+3=0
8x=0-3
8x=-3
x=-3/8
b) 3/4-9/2 x=0
3/4-18/4 x=0/4
3-18x=0
-18x=0-3
-18x=-3
18x=3
x=3/18
x=1/6
c) -2/3 x+2/10=0
-20/30 x+ 6/ 30 =0
-20x+6=0
-20x=-6
20x=6
x=6/20
x=3/10
d) -1/100x-1/10=0
-1/100x-10/100=0/100
-x-10=0
-x=10
x=-10
e) -14/5-3/2x=0
-28/10-15/10 x=0
-28-15x=0
-15x=28
x=-28/15
f) 4x=0+0,4
4x=0,4
x=0,4:4
x=0,1
x=1/10.