=(3radical7)la a2a - 2*(ori) 3radical7 * 1 + 1la a2a + 3la a2a - 2*3*radical7 +(radical7)la a2a - 5(2radical7 + 3) - 3radical7(2radical7 +3) -80 +12radical7= =63 - 6radical7 +1 +9 -6radical7 +7 -10radical7- 15 - 4 - 9radical7 -80 +12radical7= = -19 -19radical7