Question

rezolvat ecoatiile

a.x+1,3=2,5;
b.2,87-x=1,07;
c.3x+10,25=17,75;
d.2x-7,51=12,25;
e.4x+45,7=98,2;
f.2,1ori x-0,3=2,22;
g.15-3,5ori x=4,5;

Answer 1

a)
x= 2,5 - 1,3
x= 1,2
b)
x=2,87 - 1,07
x= 1,8
c)
3x = 17,75 - 10,25 
3x = 16,5
x=16,5 :3 
x= 5,5 
d)
2x = 12,25+7,51
2x = 19,76
x=19,76:2
x=9,88
e)
4x = 98,2 - 45,7 
4x = 52,5 
x=52.5 : 4
x= 13,125
f)
2,1x = 2,22 + 0,3
2,1x = 2,52
x= 2,52 :2,1 
x= 1,2
g)
-3,5x = 4,5 - 15
-3,5x= - 10,5
x= -10,5 : -3.5
x= 3