December 2018 1 24 Report
Czy zadanie " wykaż, że jeśli a<-2 i b > 1/2 to 2ab <a + 2 - 4b
Moja metoda:

a < -2 b > 1/2
a < -2 b < -1/2

2ab < -2
a + 2 < 0
-4b < 1
wiec z tego wynika, że 2ab < a + 2 - 4b C.N.D
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