Merkwaardige Producten
remarkable products
70
\(x+\frac1x=3\;\Rightarrow \; x^2+\frac{1}{x^2}=\,?\)
71
product is 343 
72
(a − b)²
73
\(\large \frac {a\,+\,b} {a\,-\,b} = \frac {a\,+\,b} {a}\)
74
\(\small5^x\!+\!5^{-x}\!= 3 \Rightarrow 25^{x}\!+\!25^{−x}=?\) 
zie ook :
→ telling vanaf 16 aug 2024 ←