Răspuns:
Explicație pas cu pas:
√18 = √9*2 = 3√2
0,(2) = 2/9
√0,(2) = √2/9 = √2/3
4/√18 = 4/3√2 = 4√2/6 = 2√2/3
2√2/3 + √2/3 = 3√2/3 = √2
√2*√2 = 2
_________
0,(3) = 3/9 = 1/3
√0,(3) = 1/√3 = √3/3
2/√3 = 2√3/3
√3/3 + 2√3/3 = 3√3/3 = √3
√3*√3 = 3
_________
2 + 3 = 5