9 9 9 9＝10

9　 9　 9 　9 = 10

Quiz. Put any of the addition, subtraction, multiplication, division, or precedence ( ) between the above 9 and 9 to get the result of the calculation to 10.

Do the calculation in decimal system. This is not a binary, tricky, or bazzle quiz. You can use a calculator and get the result of the calculation as usual.

Nothing will appear, but if you solve the problem, please send it to norukia.jp@gmail.com

Please contact Masahiro Ishizuka.

https://aon.tokyo

10進数の9が4個あります。

9と9の間に＋−✕÷のいずれかを入れ、必要なら優先の（）を使用しても良く、計算結果を10にして下さい。とんちやトリックではありません。