Question

calculati folosind formulele de calcul prescurtat :

(3-√2)² ; (2-√3)²; (4+√2)²
(4-√3)²; (5-√2)²; (√5+√3)²
(√5-√2)²; (√5+√7)²; (√3+2)²

Answer 1

( a + b )*2 = a*2 + 2•a•b + b*2

( a - b )*2 = a*2 - 2•a•b + b*2

( 3 - r2)*2 = 9 - 6r2 + 2 = 11 - 6r2

( 2 - r3 )*2 = 4 - 4r3 + 3 = 7 - 4r3

( 4 + r2 )*2 = 16 + 8r2 + 2 = 18 + 8r2

....