x-y=x-2=0
x=2 y=2
I3x-2yI
=I3x2-2x2I
=I2I
=2
希望能帮你忙,懂了请采纳,如果a与b互为倒数,m和n互为相反数,若丨x丨=3,求代数式2ab-3m-3n+x/3的值是3mab=1m+n=0x=3或-3 2ab-m-3n+x/3=2-(m+3n)+1 =3-2n或=2-(m+3n)-1=1-2n得不到具体的,m-3n这里错了吧?是3m-3n,对不起那就是3 或 13m+3n=0=2-(3m+3n)+1 =3或=2-(3m+3n)-1=1希望能帮你忙,不懂请追问,懂了请采纳,谢谢抱歉我在问一道,若丨a+b-3丨与丨a-5丨互为相反数,求丨a丨与-(-b)的值,谢谢a+b-3=a-5=0a=5b=-2IaI=5-(-b)=b=-2
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