Решите плиз плизззззз

Question

Решите плиз
плизззззз

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Answer 1

1 : 1/36 - 1/45 = 1 : 45/1620 - 36/1620 = 1 : 9/1620 = 1 : 1/180 = 
= 1* 180/1 = 180