5 + 4 = ?, 5 = 4, 5.4, 5 : 4 = ?, 5 + 4, (-5) + (-4), 5-4, 5 + 4 =, 5/4, 5 – 4, 5 : 4, (-5) . 4, 5 4, 5 × 4, 5) + (−4, 5.(-4, 5)².4, 5 + - 4 =, 5=4, 5|+|4, 5.4≈ ;, |−5|.|−4|, 5 × 4 = …, 5 × 4 = …..