According to the characteristics of the following formula, guess a four character idiom (1) 0 + 0 = 0 (2) 0 + 0 = 1 (3) 1x1 = 1 (4) 1-1 = 2 (5) 100-1 = 1 (6) 9 divided by 9 = 1

According to the characteristics of the following formula, guess a four character idiom (1) 0 + 0 = 0 (2) 0 + 0 = 1 (3) 1x1 = 1 (4) 1-1 = 2 (5) 100-1 = 1 (6) 9 divided by 9 = 1

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