問題文全文(内容文)：
3つの連続した奇数を小さい方から順に$a,b,c$とする.
$b^2=2025$のとき,$ac$はいくつか?

問題文全文(内容文)：
入試問題　東京電機

因数分解せよ。
$x^8-16$

問題文全文(内容文)：
Let's enjoy oriental mathematics for just a little while.
You will discover a cute world from mathematics.
Everyone in the world should love and be good at mathematics.

We are introducing the entrance exam questions for Japanese high schools.
It's an important issue for you to understand the basics of mathematics.
Would you like to solve this math problem and check out our commentary?

問題文全文(内容文)：
【中学数学】正多面体の性質～辺，面，頂点の数の求め方

問題文全文(内容文)：
\( a+b=\frac{1}{2}\) , \( b+c=\frac{1}{3}\) , \( c+a=\frac{1}{6}\)のとき
\( a^2+b^2+c^2+2ab+2bc+2ca\)
の値を求めよ