Question

Exercițiile 5 si 1 va rog din sufleeeet
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Answer 1

5
a) 2+4(1-√27)+6(√12-2)=2+4(1-3√3)+12√3-12=2+4-12√3+12√3-12=
=2+4-12=-6

b)(2√14-√7/2-5√8/7) :3/√7=
=(2√14-√7/√2-10√2/√7) ×√7/3=
=14√2/3-7/3√2-10√2/3=
=4√2/3-7√2/6=
=(8√2-7√2)/6=
=√2/6
c)√(2-√5)²-√5 =√5-2-√5=-2
2-√5<0  √(2-√5)²=I2-√5I=-(2-√5)=√5-2
d) 6/√2[√0,(8)-√12,5]=3√2[√(8/9)-√125/10]=3√2[2√2/3-5/√2]=
=3√2[2√2/3-5/√2]=4-15=-11

1.
a=√28-√72+√80=2√7-6√2+4√5=2(√7-3√2+2√5)
b=-√63+√162-√180=-3√7+9√2-6√5=-3(√7-3√2+2√5)

c=(√3-1)/√3+(√5-√3)/√15+(√7-√5)/√35+(√9-√7)/√63=
=1-1/√3+1/√3-1/√5+1/√5-1/√7+1/√7-1/√9=
=1-1/3=2/3

a:b+c=2(√7-3√2+2√5) :-3(√7-3√2+2√5)+2/3=-2/3+2/3=0