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A certain tailor shop employs 10 workers who can normally complete an industrial order in 112 days; however, the shop is prone to power outages, and each outage results in the loss of a full day of work. After 61 days working on a particular industrial order, the shop had had 5 power outages. At the beginning of the 62nd day of work, in order to make up for the outages, the management hired 4 new workers who work at the same pace as the other employees. In the end, the order took 105 days to complete. How many power outages did the tailor shop have after it brought on the new workers?
181215 $$(4^{3})^{2}$$*$$(5^{2})^{3}$$+$$16^{3}$$*$$(5^{3})^{2}$$=?
190321 How much water should be added into the 20m^3 alcohol solution whose concentration is 80% to get the alcohol solution whose concentration is 50%?
190310 Which of the following lines only passes through only one point whose abscissa and ordinate are integers?
模考带练机经题 $$\frac{(1+\frac{1}{2})}{(1+\frac{1}{5})}$$ = x*$$\frac{1+\frac{1}{5})}{(1+\frac{1}{2})}$$ What is the value of x?
190302 $$2^{x}$$=$$4^{a}$$.What is the relationship between a and x?
190407 All the students in a class can sing or dance. The number of students who can both sing and dance is one fifth of those who can sing and one fourth of those who can dance. How many times as many students can only sing as those can only dance?
190407 f(m,n)=$$(-1)^{m}$$$$\frac{n}{2m+n}$$,g(n)=min{f(1,n),f(2,n),f(3,n)}.当n = 1,2,3时,g(n)的最大值是多少?
190124 It took a person 15 minutes to reach B from A and 25 minutes to ride from B to A. The distance between A and B is 2 km. What`s the average speed of the person?
190124 还原机经选题: 文字题&几何 The distance between the point (x,0) and (-1,3) equals to that between (x,0) and (8,4). x=?
190124 It takes a person 15 minutes from home to the store and 25 minutes from the store to home. The distance from home to the store is 2km. What is the average speed of this person in two sections?
190124 There are three blue balls, five green balls and two red balls in an opaque box. Two balls are taken out randomly. What is the probability that one ball is blue and the other is green?
190310 The area of a regular hexagon is $$72 \sqrt{3}$$. What is the length of each side of the regular hexagon?
181215 A post office issued 10 of new stamps. Someone collected three of them. If two of the 10 stamps are chosen, what is the probability that none of the two stamps will be included in the three collected by this person?
190215 n small balls with radius r were put into a cylinder filled with water, and the small balls were completely submerged in the water. The radius of the bottom circle of the cylinder is 4r, and the height of water before and after putting the balls is $$h_1$$ and $$h_2$$. How to express the difference of $$h_2$$ and $$h_1$$ with n and r?
190302 $$t^{3}$$=3. $$t^{2}$$=?
190302 $$x^{2}$$+$$y^{2}$$+$$z^{2}$$=16,xy+yz+xz=8,x,y,z > 0 .x+y+z=?
190207 $$\frac{2^{16}*5^{6}}{8^{3}}$$=?
190207 There are three colors of candy in an opaque bag, including two white candy, three red candy and one blue candy. Two candies will be taken out randomly from this bag. What's the probability of taking at least one white candy?
190415 A circle has the same area as a square. What is the ratio of the diagonal of the square to the diameter of the circle?