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Mathematics for IGCSE & O level - Indices 2 (Section 1 - No. 2)

Which of the following is equivalent to (x-1 + y-1)?
x + y
1/(x+y)
1/x + 1/y
xy

Erläuterung

x-1 is the same as 1/x, and y-1 is the same as 1/y

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