- #1

solakis1

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1) \(\displaystyle x+y+z+w=22\)

2) \(\displaystyle xyzw=648\)

3)\(\displaystyle \frac{1}{x}+\frac{1}{y}=\frac{7}{12}\)

4) \(\displaystyle \frac{1}{z}+\frac{1}{w}=\frac{5}{18}\)