Помогите плиз номер с275

Question

Помогите плиз номер с275

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Answer 1

1) 7/6 = 7*3/6*3 = 21/18 

2) 4/15 = 4*4/15*4 = 16/60 

3) 12/13 = 12*6/13*6 = 72/78

4) 15/17 = 15*3/17*3 = 45/51