Question

Calculati x din: a) 2∙x + 1,5∙(x + 4) = 6 – x b) 3∙x + 2∙(1,8 + 0,2∙x) = 7,2 + 0,4x

Answer 1

a ) 2x+1,5∙(x+4)=6-x
2x+1,5∙x+1,5∙4=6-x
2x+1,5x+1,5∙4=6-x
2x+1,5x+6=6-x
3,5x+x=6-6
3,5x+x=0
4,5x=0
4,5x supra 4,5=0
R=0
B-ul nu il stiu 

Answer 2

2x+1.5x+6=6-x
3.5x+6=6-x
2.5x=0
x=0



3x+3.6+0.4x=7.2+0.4x
3.4x+3.6=7.2+0.4x
3x+3.6=7.2
3x=7.2-3.6
3x=3.6
x=3.6:3
x=1.2