Răspunsuri

2014-10-30T16:47:28+02:00
30 la puterea a 2 a = 900 - 19 = 881

5x+52-31 = 881

5x+52 = 881 + 31 = 932

5x = 932-52 = 880

x = 880 : 5 = 176
1 5 1