Răspuns
b. 3√3
d. √7
Explicație pas cu pas:
b. 17\6√3+9\2√3+5\3√3=
(6*17√3)\(36*3)+(9*2√3)\\(4*3)+(5*3√3)\(9*3)=
102√3\108+18√3\12+15√3\27=
[(102√3+(9*18)√3+(4*15)√3]\108=
(102√3+162√3+60√3)\108=
324√3\108=3√3
d. 21\2√7-12\5√7-11\10√7=
(21*2√7)\(4*7)-(12*5√7)\(25*7)-(11*10√7)\(100*7)=
42√7\28-60√7\175-110√7\700=
[(25*42√7)-(4*60√7)-(110√7)]\700=
(1050√7-240√7-110√7)\700=
700√7\700=√7
