Odpowiedź :
0,4 * x +5 = 6 1/4
0,4x =6 1/4 - 5
0,4x =1 1/4
0,4x =5/4
x=5/4*10/5
x=25/8
0,4x =6 1/4 - 5
0,4x =1 1/4
0,4x =5/4
x=5/4*10/5
x=25/8
0,4*x+5=6 1/4
4/10*x+5=6 1/4
2/5*x+5=6 1/4
2/5x=6 1/4 -5
2/5x=1 1/4
x=1 1/4: 2/5
x =5/4 :2/5
x=5/4 *5/2
x=25/8
x=3 1/8
4/10*x+5=6 1/4
2/5*x+5=6 1/4
2/5x=6 1/4 -5
2/5x=1 1/4
x=1 1/4: 2/5
x =5/4 :2/5
x=5/4 *5/2
x=25/8
x=3 1/8