Răspuns:
a) x+12/100*x=56
x+12x/100=56
100x+12x=5600
112x=5600
x=5600/112
x=50.
b)x-30/100*x=28
100x-30x=2800
130x=2800
x=2800/130
x=280/13.
c)3x=10+x
3x-x=10
2x=10
x=10/2
x=5.
d)(15-2x)*6=0,5x
90-12x=5x/10
90-12x=x/2
x/2+12x=90
x+24x=180
25x=180
x=180/25
x=36/5.
Explicație pas cu pas:
sper sa te ajute