<span>121^7*2^10/242^6 = 121^7*2^10/121^6*2^6=121*2^4=121*16=1936</span>
<span>(√10+√5)√20-5√8=√200+√100-5*2√2=10√2+10-10√2=10</span>
Ответ: 20.