Question

Va rog ajutatima
Cine imi face si mie ex 29 , 31 , 33 ,35 , 36
Dau coroana

Answer 1

29. √2(√2+√3)-√3(2√3+√2)=
    =2+√6-2×3-√6=
    =2-6=
    =-4

31. (√7+√3)(√7-√3)=
    =7-3=
    =4

33.  5√2/2√5-3/√10=
     =5√10/2×5-3√10/10=  (aici am raționalizat)
     =√10/2-3√10/10=
     =5√10/10-3√10/10=    (aici am adus fracțiile la același numitor)
     =2√10/10=
     =√10/5

35.  3(7/2-125/100×2)-(√5-25/10/√5)×√5=
      =3(7/2-5/2)-(√5-√5/2)×√5=
      =3×7/2-3×5/2-(5-5/2)=
      =21/2-15/2-5+5/2=
      =21/2-15/2-10/2+5/2=
      =1/2

36.  (-1)^21+5/2:√25/100-20√300/300+4√3/6=
      =-1+5/2:5/10-20×10√3/300+2√3/3=
      =-1+5/2×10/5-2√3/3+2√3/3=
      =-1+5=
      =4