問題文全文(内容文)：
最初につまずく因数分解の紹介
$a(b^2-c^2)+b(c^2-a^2)+c(a^2-b^2)$

問題文全文(内容文)：
$a-b=1$ , $b-c = 2$ のとき
$(a-c)^2$=

海星高校

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)：
計算の裏技紹介動画です

問題文全文(内容文)：
①
$(x+a)(x-a)=$

②
$(x+a)^2$
$(x-a)^2$

③
$(x+a)(x+b)=x^2+(a+b)x+a\times b$