4. √3 22/49 · 5 4/81 = √(3·49+22)/49 · √ (5·81+4)/81 = √(147+22)/49 · √ (405+4)/81 = √169/49 · √ 409/81 = 13/7 · 20/9 = 260/63 = 4 8/63
Ответ: 4 8/63