Question

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срочно помогите дам 49б​

Answer 1

18/19-7/19+3/19=(18-7+3)/19=14/19

9/11-3/11-2/11=(9-3-2)/11=4/11

11/15-(3/15+7/15)=(11-(7+3))/15=(11-10)/15=1/15