Question

2. Calculati folosind formulele de calcul prescurtat :

e) (2√3+3)( 2√3-3)-(√2-1)(√2+1) = ?
f) (3-√6)(3+√6)+(√3-1)(√3+1)-(3-√5)(3+√5) = ?
g) (4-2√5)(4+2√5)+(3√2-5)(3√2+5)-(√6+√2)(√6-√2) = ?

Answer 1

e) (12-9)-(2-1)=3-1=2 f) (9-6)+(3-1)-(9-5)=3+2-4=1 g) (16-20)+(18-25)-(6-2)=-4-7-4=-15