(1)原式=( 1 2 )2+( 2 2 )2+ 2 × 3 2 ×1= 1 4 + 1 2 + 6 2 = 3 4 + 6 2 ;(2)移项,得x2-2x-2x=1合并,得x2-4x=1配方,得x2-4x+22=1+22(x-2)2=5x-2=± 5 x1= 5 +2,