(6分) 已知a、b互为相反数,c、d互为倒数,,求代数式:的值....

2023-05-14 09:06发布

这道初中数学的题目是:
(6分) 已知ab互为相反数,cd互为倒数,
求代数式:的值.
1条回答
恨江流
2023-05-14 09:25
这道初中数学题的正确答案为:
的值为1或– 7
解题思路 解:由题意得:a + b = 0,cd = 1,············································· 2分
①当m = 2时,原式··········································· 4分
②当m =" –" 2时,原式
···································································· 6分

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