Răspuns:
Explicație pas cu pas:
2,(3) = (23-2)/9 = 21/9
√81/784 = 9/28
√12,96 = 3,6 = 36/10
√0,36 = √(36/100) = 6/10
√0,1024 = 0,32 = 32/100
√0,64 = √(64/100) = 8/10
_________
21/9*9/28 + 36/10 : 6/10 - 32/100 : 8/10 =
= 3/4 + 36/10 *10/6 - 32/100*10/8 = 3/4 + 6 - 4/10 = 0,75 + 6 - 0,4 = 6,35
