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It f:Q to Q be a function defined f(x+y)...

It `f:Q to Q` be a function defined `f(x+y)=f(x)+f(y)` for all `x,y epsilon Q`. Show that `f(x)=xf(1)` for all `x,y epsilon Q`. Show that `f(x)=xf(1)` for all `x epsilon R`.

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