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The boss was late for the meeting because his alarm clock didn't _____
1年前
What is the most probable relationship between the speakers?
1年前
四边形ABCD中,向量AB=a,向量BC=b,向量CD=c,向量DA=d,若a*b=b*c=c*d=d*a,求证四边形为矩形 a b c d都是向量
1年前
42的因数中,素数有______,合数有______,奇数有______,偶数有______.
1年前
A.B两地相距630KM,甲乙两列火车从两地同时,已知甲相向而行,3小时相遇乙两地列车速比是4:3,求乙车速度
1年前