已知A和2B互为倒数,-2C和D互为相反数,|X|=3,求代数式2AB-2C+D+3/X
人气：475 ℃ 时间：2019-10-23 08:19:12
解答
A和2B互为倒数
A*2B=1
-2C和D互为相反数
-2C+D=0
|X|=3
X=±3
2AB-2C+D+3/X
=1-0+3÷(±3)
=1±1
=0或2
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