求[（a²+b²）+2b（a-b）-（a-b）²]÷4b的值（已知2a-b=5）

来源：学生作业学帮网编辑：学帮网时间：2024/06/01 04:40:09

[（a²+b²）+2b（a-b）-（a-b）²]÷4b
=[a²＋b²＋2ab-2b²-(a²-2ab+b²)]÷4b
=[4ab-2b²]÷4b
=(2a-b)除以2
=5/2

[（a²+b²）+2b（a-b）-（a-b）²]÷4b
=[2ab+2b(a-b)]÷4b
=2b(2a-b)÷4b
=5/2