(1)当a=2,b=2时, a+b 2 = 2+2 2 =2, ab = 2×2 =2, a+b 2 = ab ;(2)当a=3,b=3时, a+b 2 = 3+3 2 =3, ab = 3×3 =3, a+b 2 = ab ;(3)当a=4,b=4时, a+b 2 = 4+4 2 =4,