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20.03.2020 •
Mathematics
Find two consecutive integers whose sum is the square of 7
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Ответ:
Step-by-step explanation:
Two consecutive integers be x and (x+1)
x + x +1 = 7²
2x + 1 = 49
2x = 49 - 1
2x = 48
x = 48/2
x = 24
The consecutive integers are: 24,25
Ответ:
AC bisects ∠BAD, => ∠BAC=∠CAD (1)
thus in ΔABC and ΔADC, ∠ABC=∠ADC (given),
∠BAC=∠CAD [from (1)],
AC (opposite side side of ∠ABC) = AC (opposite side side of ∠ADC), the common side between ΔABC and ΔADC
Hence, by AAS axiom, ΔABC ≅ ΔADC,
Therefore, BC (opposite side side of ∠BAC) = DC (opposite side side of ∠CAD), since (1)
Hence, BC=DC proved.