Question

ajutati ma ...la primu exercitiu la a ...nu stiu ce am scris ...stiu sunt prost.......dar ajutati ma la restu va las poza ... v rog ajutati ma este urgent

Answer 1

a)√63-3(2√7-4√3)+4(2√3+5√7)=
=3√7-6√7+12√3+8√3+20√7=
=+20√3+17√7

b)√5×(√125+√20-√180)-3√5×√80=
=√5×(5√5+2√5-6√5)-3√5×4√5=
=√5×(7√5-6√5)-4×5=
=√5×√5-20=
=5-20=-15

24/5√6=24√6/5×6=4√6/5
5/2√3=5√3/2×3=5√3/6
16/5√7=16√7/5×7=16√7/35
4/2√2=4√2/2×2=√2
5/(3-2√2)=5(3+2√2)/(3-2√2)(3+2√2)=5(3+2√2)/(9-8)=5(3+2√2)=15+10√2
6/(3√2+4)=6(3√2-4)/(3√2+4)(3√2-4)=6(3√2-4)/(18-16)=6(3√2-4)/2= =3(3√2-4)=9√2-12


2 4/5 +2 1/4 x = 3 2/5
14/5 +9x/4 =17/5
9x/4 =17/5-14/5
9x/4 =3/5
x=4×3/9×5
x=4/15

(2x-5)/7=(2-x)/3
3(2x-5)=7(2-x)
6x-15=14-7x
13x=29
x=29/13

(2√7-3√2)²=28-12√14+18=46-12√14
(5+√2×√3)²=(5+√6)²=25+10√6+6=31+10√6
(3√3-√5)(3√3+√5)=(3√3)²-(√5)²=27-5=22