{a+b-3/5}{a-b+3/5}
问题描述:
{a+b-3/5}{a-b+3/5}
答
{a+b-3/5}{a-b+3/5}
={a+(b-3/5)}{a-(b-3/5)}
=a2-(b-3/5)2
=a2-b2+6b/5-9/25