2㏒₇16 2㏒₇2⁴
----------------------------------------- = ------------------------------------ =
㏒₃(√10 -1) + ㏒₃(√10 +1) ㏒₇2 ㏒₃((√10 -1) *(√10 +1) )㏒₇2
2*4㏒₇2 8 ㏒₇2 8 ㏒₇2
= ---------------------- = ---------------- = ------------------- = 8/2 =4
㏒₃(10 -1) *㏒₇2 ㏒₃9 *㏒₇2 2㏒₃3 *㏒₇2
а)4а^2-б^4
б)а(2+с)-б(2+с)=(2+с)(а-б).
Sin²(180-a)+tg²(180+a)*tg²(270+a)+
+sin(90+a)cos(360-a)=sin²a+tg²a*ctg²a+cosa*cosa=sin²a+1+cos²a=2
(a+2)./(a+2)ˇ2 -4a/=(a+2)./aˇ2+4a+4-4a/=(a+2).(aˇ2+4)