已知a+b=4,a-b=3.求a²-b²的值
问题描述:
已知a+b=4,a-b=3.求a²-b²的值
答
a²-b²
=(a+b)(a-b)
=4x3
=12
已知a+b=4,a-b=3.求a²-b²的值
a²-b²
=(a+b)(a-b)
=4x3
=12