4-(根号5-2)乘(根号5+2)

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4-(根号5-2)乘(根号5+2)

4-(根号5-2)乘(根号5+2)
4-(根号5-2)乘(根号5+2)

4-(根号5-2)乘(根号5+2)
4-(根号5-2)乘(根号5+2)
=4-(√5-2)×(√5+2)
=4-[(√5)²-2²]
=4-(5-4)
=4-1
=3

最后答案是3

4-(根号5-2)乘(根号5+2)
=4-(5-4)
=4-1
=3

4-(√5-2)*(√5+2)
=4-(5-4)
=4-1
=3

(a+b)(a-b)=a^2-b^2
题目=4-(5-4)=3

楼主您好:
4-(√5-2)×(√5-2)
=4-[(√5)²-2²]
=4-(5-4)
=4-1
=3
祝楼主学习进步