Question

1/4×6.16²-4×1.04²

各位，讲解尽量详细点！最好有过程！谢谢！尽快答复！

Answer 1

运用平方差公式：

1/4×6.16²-4×1.04²
=(1/2x6.16+2x1.04)(1/2x6.16-2x1.04)
=(3.08+2.08)(3.08-2.08)
=5.16

追问

Dear，为什么不解释一下每一步呢？

追答

1/4×6.16²=(1/2x6.16)²

4×1.04²=(2x1.04)²

运用平方差公式：a²-b²=(a+b)(a-b)

1/4×6.16²-4×1.04²
=(1/2x6.16+2x1.04)(1/2x6.16-2x1.04)
=(3.08+2.08)(3.08-2.08)
=(5.16)•(1)
=5.16

Answer 2

1/4×6.16²-4×1.04²
=1/4(6.16^2-4.16^2)=1/4(6.16+4.16)(6.16-4.16)=5.16

Answer 3

1/4×6.16²-4×1.04²
=1/4×6.16²-1/4×4²×1.04²
=1/4×6.16²-1/4×6.16²
=0

Answer 4

请采纳！！