若(5a+3b)²=A+(5a-3b)²,则A的纸为【60ab】
(5a+3b)²=A+(5a-3b)²
A=(5a+3b)²-(5a-3b)²
=[(5a+3b)+(5a-3b)][(5a+3b)-(5a-3b)]
=(10a)(6b)
=60ab
请点击下面的【选为满意回答】按钮.
若(5a+3b)²=A+(5a-3b)²,则A的纸为【60ab】
(5a+3b)²=A+(5a-3b)²
A=(5a+3b)²-(5a-3b)²
=[(5a+3b)+(5a-3b)][(5a+3b)-(5a-3b)]
=(10a)(6b)
=60ab
请点击下面的【选为满意回答】按钮.