Помогите быстрей !!!!!!!+

Question

Помогите быстрей !!!!!!!+

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Answer 1

(c-5)^2/(2c+4)*2(2c+4)/(c-5)(c+5)=2(c-5)/(c+5)
2(7.5-5)/(7.5+5)=(2*2.5)/12.5=5/12.5=0.4