a√2 + 5a - b·3√2 - b = 5 + 6√2
( 5a - b ) + ( a - 3b )·√2 = 5 + 6√2
sunt egale daca :
5a - b = 5 5a - b = 5
( a - 3b )·√2 = 6√2 a - 3b = 6
5a -b =5 ; b = 5a -5
a - 3· ( 5a - 5) = 6
a - 15a + 15 = 6
-14·a = 6 - 15
-14·a = - 9
a = 9 /14 ; b = 5· 9 /14 - 5 = ( 45 - 70 ) / 14 = -25 /14