Question

Rezolvati, in Q, ecuatiile: a)2x/5=4/15; b)x+1/3=2/5; c)2x+1/4=5/6; d)2x+6/5-0,5=-1/10; e)2*(4x+3)=2/3; f)3/5=6/3x+1. REPEDE VA ROG

Answer 1

a)2x/5=4/15;
2x*15=5*4
30x=20
x=2/3
b)x+1/3=2/5;
x=2/5-1/3
x=6/15-5/15
x=1/15
c)2x+1/4=5/6;
2x=5/6-1/4
2x=20/24-6/24
x=14/24
x=7/12
d)2x+6/5-0,5=-1/10;
2x=-6/5+5/10-1/10
2x=-12/5+4/10
2x=-24/10+4/10
2x=-20/10
2x= -2
x=-1
e)2*(4x+3)=2/3;
8x+6=2/3
24x+18=2
24x=-18+2
24x=-16
x=-2/3
f)3/5=6/3x+1
2x=3/5-1
2x=3/5-5/5
2x= -2/5
10x= -2
x= -1/5