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
