Question

Ex 2,3, HELP!!!!!!!!!!!!!

Answer 1

(√2-1)/√2+(√3-√2)/√6 +(√4-√3)/√12=
=(√2-1)√2/2+(√3-√2)√6/6 +(√4-√3)√12/12=
=(2-√2)/2+(√18-√12)/6 +(√48-√36)/12=
=(2-√2)/2+(3√2-2√3)/6 +(2√3-3)/6=
=(2-√2)/2+(3√2-2√3 +2√3-3)/6=
=(2-√2)/2+(3√2-3)/6=
=(2-√2)/2+(√2-1)/2=
=(2-√2+√2-1)/2=
=(2-1)/2=
=1/2


a=ap cu 2 camere
b=ap cu 3 camere
a+b=42        b=42-a
2a+3b=115
2a+3(42-a)=115
2a+126-3a=115
a=11 ap cu 2 camere
b=42-11=31 ap cu 3 camere