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вика4032
@вика4032
August 2022
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докажите чтотнеравенство (а-9)(а+3)<(а-7)(а+1) верно при любых значениях а
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dashka20081
Раскроем скобки:
a²-9a+3a-21<a²-7a+a-7
a²-6a-21<a²-6a-7
a²-a²-6a+6a<-7+21
0<14
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a²-9a+3a-21<a²-7a+a-7
a²-6a-21<a²-6a-7
a²-a²-6a+6a<-7+21
0<14