a^2-10a-11因式分解
问题描述:
a^2-10a-11因式分解
答
a^2-10a-11
=(a-11)(a+1)
十字相乘
a ﹣11
×
a 1a^2+4ab+3b^2a^2+4ab+3b^2=(a+b)(a+3b)也是十字相乘