Question

Exercitiile 1 ,2,3 .
Dau coroana!!!!!!
Am nevoie urgent de ele !!!
Va rog!!!

Answer 1

Ex:1
(2/5√3-1/√12+3/√75)*2√3=
=(2/5√3-1/2√3+3/5√3)*2√3=
=(2√3/5√3*√3-√3/2√3*√3+3√3/5√3*√3)*2√3=
=(2√3/15-√3/6+3√3/15)*2√3=
=(4√3-5√3+6√3/30)*2√3=
=5√3/30*2√3=30/30=1;
Raspuns:1.

Ex:2;
(x+y)/y=7/3
3(x+y)=7y
3x+3y=7y
3x=7y-3y
3x=4y
x/y=4/3
Raspuns:x/y=4/3;

Ex:3;
a+c=9
a+b=7

c=9-a
b=7-a

Deci, vom avea:
3a+2(7-a)+9-a=3a+14-2a+9-a=23;
Raspuns:3a+2b+c=23;

Bafta!