191222
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$$\frac { x + 1 } { 1 - x } > 0 ?$$
(1)x>0
(2)x<1
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191222 730高分节-数学测试
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A four-digit integer is formed by the numbers of 2, 3, 5, and 7. If four digits are all different, what is the probability that the four-digit integer greater than 5237?
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191222
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In a store, there are 3 types of bags, namely B, S, and Z. The number of B-type bags is 33; the number of S-type bags is 24, and the number of Z-type bags is 29, other information has been given in the table below. What's the total number of these bags?
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还原机经选题 191222
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The "ultimate number" can be calculated in this way: add up the values of each digit until there is only one digit left. For example, 9901, 9+9+0+1= 19, 1+9= 10, 1+0=1, 1 is the "ultimate number" of 9901. How many two-digit numbers are there that have the same ultimate number as 50645?
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191222
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The sum of the squares of the first n positive integers is a multiple of 4, what is n likely to be?
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191222
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N is an integer. Can (n-1)*n*(n+1) be divisible by 12?
Condition 1 :(n-1)(n+1) is even
Condition 2: n is odd
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191222
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x^5+2x^4+x^3>0?
Condition 1:x > -1
Condition 2:x < 0
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191222
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BR∥AC.Is PA an Angle bisector?
Condition 1:∠PQR=∠PAC
Condition 2:∠PQR=∠PAB
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191222
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Is c/b a terminating decimal?
(1)c is a mutiple of 60
(2)b is a mutiple of 250
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191222
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Each of the three machines works at the same constant rate. It takes k hours for two machines to produce goods. It takes 2 hours less for three machines than for two machines to produce same amount of goods. What is the value of k?
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191222
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Set A and set B has the same number of elements. The number of elements in Set C is the sum of 1/4 the number of elements in Set B and 1/3 the number of elements in Set A. What is the ratio of the number of elements in Set C to the number of elements in Set A?
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191222
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Tom spends $8.5 on three bottles of beverage and one box of popcorn. Jim spends $10.5 on one bottle of beverage and two boxes of popcorn. How much does one bottle of beverage and one box of popcorn cost?
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191222
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A school holds seven meetings from Monday to Friday, at least one meeting every day. How many meetings are held on Wednesday?
1: The numbers of meetings on Monday and Wednesday are the same
2: The number of meetings on Wednesday is more than on Tuesday
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