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190215	It will take 6 hours for machine A to finish a task. If machine A and machine B work at the same time, can they finish the same task in 3 hours? 1: Machine B is twice as efficient as machine A. 2: The efficiency of machine B is higher than that of machine A.
190215	f( $x_0$ )=47000,x=?
190215	The size of a playground is shown in the figure. How much longer is the distance around the outer ring of the playground than that around the inner ring?
190215	80% of the graduate students in a university is RA, and 60% of them is TA. What is the probability that at least one of the two randomly selected students in the university has at least one identity?
190215	There are 30 objects of various colors and shapes in a bag. An object will be taken out randomly from the bag. What is the probability that the object is red or cube? 1: There are 5 cubes and 8 red objects in the bag. 2: There are three red cubes in the bag.
190215	5 $x^{2}$ - 2x - 39=0(x > 0).x=?
190215	The two diagonals of the diamond are 10 and 24 in length. What is the circumference of the diamond?
190215	$\frac{1}{10^{n+1}}$ < 0.00068 < $\frac{1}{10^{n}}$ .n=?
190215	x > 0,y < 0,z > 0. $\|x+y+z\|^{2}$ =?
190215	The equilateral triangle ABC is inscribed on the circle O. What is the ratio of the circumference of circle O to the circumference of triangle? 1: The area of a circle is s $cm^{2}$ , and the circumference of a triangle is s cm. 2: The radius of the circle is r cm.
190215	D is the center of the circle. There are three points A, B and C on the circle. ∠ABC=？ 1：∠CAD=70° 2：∠DAC=55°
190215	$\frac{2\sqrt{3}-2}{\sqrt{3}-2}$ =?

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