Răspuns :
2. Calculati:
a) 13/8 + 2/8 - 5/8 = (13 + 2 - 5)/8 = 10/8 = 5/4
b) 2/5 - 3/11 = (22 - 15)/55 = 7/55
c) 1/5 + 5/13 - 3/14 = (182 + 350 - 195)/910 = 337/910
3) 31/17 = 62/(x-2)
31(x - 2) = 17 · 62
31x - 62 = 1054
31x = 992
x = 32
4) 15,26 = 1526/100 = 763/50
0,(8) = 8/9
4,29(5) = 3866/900 = 1933/450
a) 13/8 + 2/8 - 5/8 = (13 + 2 - 5)/8 = 10/8 = 5/4
b) 2/5 - 3/11 = (22 - 15)/55 = 7/55
c) 1/5 + 5/13 - 3/14 = (182 + 350 - 195)/910 = 337/910
3) 31/17 = 62/(x-2)
31(x - 2) = 17 · 62
31x - 62 = 1054
31x = 992
x = 32
4) 15,26 = 1526/100 = 763/50
0,(8) = 8/9
4,29(5) = 3866/900 = 1933/450