// // 実数の関数 \(\it f\) (\(\it x\))が ● \(\it f\) (\(\it a\)\(\cdot\)\(\it b\))＝\(\it f\) (\(\it a\))\(\cdot\)\(\it b\)＋\(\it a\)\(\cdot\)\(\it f\) (\(\it b\)) ● \(\it f\) (1)＝0 を満たすとき，\(\it f\) \(\left(\displaystyle \frac{1}{…