Răspuns :
x= 2/5x + 1/3(x- 2/5x)+ 74,8
x= 2/5x + 1/3x - 2/15x + 74,8
x= 6/15x + 5/15x- 2/15x + 74,8
x = 9/15x +74,8
x - 9/15x = 74,8
15/15x - 9/15x = 74,8
6/15x = 74,8
6x = 74,8 * 15
6x = 1122
x = 1122/6 = 187
x= 2/5x + 1/3x - 2/15x + 74,8
x= 6/15x + 5/15x- 2/15x + 74,8
x = 9/15x +74,8
x - 9/15x = 74,8
15/15x - 9/15x = 74,8
6/15x = 74,8
6x = 74,8 * 15
6x = 1122
x = 1122/6 = 187
1) 2x /5 ; x-2x /5 =5x =5-2x /5 =3x /5 ramas ( x=drumul )
2)1/3*3x/5 =3x/15=x/5
3) 74.8 km
2x/5+x/5 +74.8 =x ; numitor 5
2x+x+374 =5x
2x+x-5x = -374
2x =374
x =187 km
verif ; 2*187/5 +187/5 +74.8 =
74.8 +37.4 +74.8 =187 km
2)1/3*3x/5 =3x/15=x/5
3) 74.8 km
2x/5+x/5 +74.8 =x ; numitor 5
2x+x+374 =5x
2x+x-5x = -374
2x =374
x =187 km
verif ; 2*187/5 +187/5 +74.8 =
74.8 +37.4 +74.8 =187 km