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190603	It is given that f(x)=1-x, What is value of " -f{ f(-(1-x))}"
190603	Is (a+b-c)(a+b+c)=a^2+b^2-c^2 ? 1:a^2-b^2=0 2:a^2+b^2=0
190603	How many multiples of 3 are between -100 and 100 ?
190603	Now we have to choose 4 teams from 6 teams to go to the game, then how many different selection methods are there?
190603	There is a car driving at 10mile / L on the A road and 15mile / L on the B road. It is known that the car has driven a total of 650 miles and consumed a total of 50L of oil. Then how far the car has been driven on the A road.
190603	Is n the difference between two prime numbers? 1: n = 11 2: (n-7) (n-11) = 0
190603	Given a table, there are now 18 courses in total, each course lasts 7 days, but only starts on weekdays, the first day starts on Friday, then when the last course ends?
190603	Given that the height of a small tree is 5√3m, what is the height of a large tree?
190603	Scores of students in a large class have a distribution that is symmetric about the mean 60. 68 percent of the distribution lies within one standard deviation 10 of the mean, and 95 percent of the distribution lies within two standard deviations of the mean. What percent of the distribution is between score of 70 and score of 80?
190603	The tailor shop needs to make 100 square handkerchiefs with a side length of 16 inches. The tailor shop can choose two different types of fabrics for processing. The length of the fabric A is 1 yard and the width is 26 inches, and the length of the fabric B is 1 yard and the width is 44 inches. The price of one piece of fabric A is $ 5, and the price of one piece of fabric B is $ 9. The tailor shop can't piece piecemeal fabrics together to make handkerchiefs. How much less is buying fabric B for handkerchiefs than buying fabric A for handkerchiefs? (1yard = 36 inches)
190603	The function of a straight line in the rectangular coordinate system is y=5x. If a straight line K is perpendicular to line y=5x, which of the following could be the expression of the line K ?
190603	Mary has two methods to depart from A to C. The first one is A-B-C with speed of 80 meters per hour, and the other one is A-C with speed of 60 meters per hour. How many hours Mary used in A-C less than used in A-B-C?
190603	There is originally a mixture of 9 liters of x and water, with water accounting for 75%. How much water was poured and replaced with same amount of x, and the final volume of water accounted for 50%?
190603	According to the picture, what is the area of the shaded part? (1)The length of arc AC= the length of chord AC +(π+8) (2)The length of arc AC ：the length of chord AC = π：$$\sqrt{8}$$
190603	The three heights of a triangle are M, H, and K. Is the perimeter of this triangle greater than 6? (1)M>2 (2)K+H>4
190603	Mary has been paying telephone bills monthly for 24 consecutive months. Is the average of 24 months of telephone bills greater than 50? Condition 1: At least the monthly bill is greater than 48 Condition 2: At least more than half of the month's phone bill exceeds 51
190603	K equals to 1 plus the product of all prime numbers from 2 to 29, inclusive, which of the following statement about k is true? I. k can be divisible by prime numbers within 2-29 II. k is divisible by 30 III. k can be divisible by a prime number greater than 29
190603	A household's water fee is calculated as follows: the fixed fee per month plus the variable fee. The fixed fee per month is 9 yuan, and the variable fee is 2.2 yuan per 1,000 when the water consumption exceeds 12,000. How much did a household with a water consumption of 13,400 pay in August?
190603	The purchase price of each car is 80w and the selling price is 120w in a company. One person sells 2 cars, and the commission for each car is 1% of the selling price. The other person sells 3 cars, and the commission for each car is 2% of the selling price. What is the profit of the company after the commission is removed?
190603	Given that x is a positive number and 2/(x+2)+3/(x+3)>1, what is the possible value of x2?