1.设A={,,},则 =________,=________,=________.
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1.设A={,,},则 =________,=________,=________.
2.设A={1,2,3},R={,},则R的自反闭包r(R)= ____________,对称闭包s(R)= ____________.
2.设A={1,2,3},R={,},则R的自反闭包r(R)= ____________,对称闭包s(R)= ____________.
第一个题目不全啊
第二题:自反闭包为={,,,},
对称闭包为={,,},
再问: 1.设A={,,},则 domA=________, ranA =________, fldA=________.
再答: domA为{a,b,c}ranA为{1,2,3}fldA为{a,b,c,1,2,3}
第二题:自反闭包为={,,,},
对称闭包为={,,},
再问: 1.设A={,,},则 domA=________, ranA =________, fldA=________.
再答: domA为{a,b,c}ranA为{1,2,3}fldA为{a,b,c,1,2,3}
She has no friends=She _______ ________ ________ ________
a bit of=________修饰________名词=_________
非负数a的平方根=________
设A*是n阶方阵A的伴随矩阵,|A|=d,则||A|A*|=________
安培换算1.0.5安培=________毫安________微安2.30毫安=________安培=________微安
a:b=ak:________=k分之a:________(k≠0)
英语翻译因此老师对他很生气= so his teacher ________ ________ ________ ___
数学试卷填空题1.(-a+b)^2=________ (-a-b)^2=______2.(1/2)^0=________
1.若a-b=5,ab=2,则(a+b)^2=________
计算:a分之2-a分之1=________.
legs of a spider--the words in beetle=________
another three pens=______ ________ pens?