19, 20, 21 and 22 are made up of 24:00 with "+, -, ×, △ and"______ .
According to the analysis, (19 + 21) △ 20 + 22, = 40 △ 20 + 22, = 2 + 22, = 24; or (21-19) × 22-20, = 2 × 22-20, = 44-20, = 24; so the answer is: (19 + 21) △ 20 + 22 or (21-19) × 22-20
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