<span> √54-14√5*(√5+7) = <span> </span><span>√54-70-98<span> </span><span>√5=3<span> </span><span>√6+28<span> </span><span>√5
Вроде так)) </span></span></span></span></span>
2ab + 4a^3 - 8ab^2 + 11 + 8ab^2 - 2 ab = 4a^3 + 11
Т.е. прибавить 8ab^2 - 2 ab
9/5.5-7/11=90/55-7/11=90/55-35/55=55/55=1