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)：
a+b+c=0,abc=2021のとき
(ab+ca)(ca+bc)(bc+ab)=

2021慶應義塾志木高等学校

問題文全文(内容文)：
平方根の見方が変わる　紹介動画です

問題文全文(内容文)：
3つの二次方程式:x^2+ax+b=0, 2x^2+3ax+9b=0, x^2-2x-3=0が同じ正の解をもつとする。このとき、定数a,bの値を求めよ。

問題文全文(内容文)：
$\sqrt{2499}$を$a\sqrt{b}$の形に直せ。