Ответ:
a)(48-45)(48+45)/(74-19)(74+19)=3*93/55*93=3/55
б)(88-53)(88+53)/(20-15)(20+15)=35*141/(35*5)=141/5=28,2
в) (89-61)(89+61)/(89-61)^2=(89+61)/(89-61)=150/28=75/14
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Ответ:
a)(48-45)(48+45)/(74-19)(74+19)=3*93/55*93=3/55
б)(88-53)(88+53)/(20-15)(20+15)=35*141/(35*5)=141/5=28,2
в) (89-61)(89+61)/(89-61)^2=(89+61)/(89-61)=150/28=75/14