题目内容
计算:[(a+b)(a-b)-(a-b)2]÷(-2b).
[(a+b)(a-b)-(a-b)2]÷(-2b),
=[a2-b2-(a2-2ab+b2)]÷(-2b),
=(a2-b2-a2+2ab-b2)÷(-2b),
=(2ab-2b2)÷(-2b),
=b-a.
=[a2-b2-(a2-2ab+b2)]÷(-2b),
=(a2-b2-a2+2ab-b2)÷(-2b),
=(2ab-2b2)÷(-2b),
=b-a.
练习册系列答案
相关题目