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If $$\frac {0.5} {\frac1 6}=\frac1 x$$, what is the value of x ?
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$$\frac{0.8^{-5}}{0.4^{-4}}=$$
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OG12 OG15 OG16 OG17
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If x(2x+1)=0 and $$(x+\frac1 2)(2x-3)=0$$,then x =
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If a certain toy store's revenue in November was $$\frac{2}{5}$$ of its revenue in December and its revenue in January was $$\frac{1}{4}$$ of its revenue in November, then the store's revenue in December was how many times the average (arithmetic mean) of its revenues in November and January?
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PREP07 Test 2
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Machine A produces pencils at a constant rate of 9,000 pencils per hour, and machine B produces pencils at a constant rate of 7,000 pencils per hour. If the two machines together must produce 100,000 pencils and if each machine can operate for at most 8 hours, what is the least amount of time, in hours, that machine B must operate?
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If $${P}({r})={8}\frac{r}{1-r}$$, for what value of r does $${P}({r})=\frac{1}{2}{P}(3)$$?
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300难题
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A school supply store sells only one kind of desk and one kind of chair， at a uniform cost per desk or per chair. If the total cost of 3 desks and 1 chair is twice that of 1 desk and 3 chairs, then the total cost of 4 desks and 1 chair is how many times that of 1 desk and 4 chairs?
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OG17 OG18
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On days 1 through 4 of a recent week, product X was out of stock at Retailer R. Day 1 shoppers are those who came to Retailer R on day 1 of that week seeking Product X. for each of the first 3 days of that week, the graph shows the subsequent behavior of all the day 1 shoppers who came to Retailer R seeking Product X on that day. Shoppers at Retailer R who purchased a different item in lieu of Product X paid an average of 30% more for the item. From each drop-down menu, select the option that creates the most accurate statement based on the information provided.% of Day 1 shoppers returned to the store on day 3.Shoppers at Retailer R who purchased substitute items from other manufacturers on day 1 paid a total amount that was approximately % of the total all day 1 shoppers would have paid had each of them been able to purchase Product X on day 1.
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190603
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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 ?
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181215
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CE=6, AB//CD. EF=？
1：AC:CE=1:2
2：CD//EF
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For each positive integer n, the integer n* is defined by $$ n^* = {n}^{2}$$ + 1. What is the value of the positive integer k ?(1) When k is divided by 4, the remainder is 1.(2) $$18 \leq k^* \leq 36$$
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PREP07 Test 1
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If n is a positive integer and r is the remainder when (n - 1)(n + 1) is divided by 24, what is the value of r ?(1) n is not divisible by 2.(2) n is not divisible by 3.
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Manhattan
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If x is an integer, is $$x^{3}$$ even?(1) $$2x + 2$$ is even.(2) $$3x + 1$$ is even.
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OG18-数学分册
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Is xy > 5?(1) $$1 \le x \le 3 and 2 \le y \le 4$$(2) x + y = 5
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PREP07 Test 1
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If y and z are integers, is y(z + 1) odd?(1)y is odd.(2)z is even.
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What is the value of positive integer n?(1).$${10}^{n}={10},{000}$$(2).$$\frac{1}{10^n}={0.0001}$$
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OG19-数学分册
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lf $$y\neq0$$,is $$|x|=1$$?
(1) $$x = \frac{y}{|y|}$$
(2) $$|x|=-x$$
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190124
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Is $$\frac{x^{2}}{x^{\frac{2}{3}}}$$ ？
1：x > 0
2：x < 1
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Ready4
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^0+(0.1)^<font color='#FE8080'>1</font>+(0.1)^2+(0.1)^3= "(0.1)^0+(0.1)^<font color='#FE8080'>1</font>+(0.1)^2+(0.1)^3=")
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If x is to be selected at random from set T,what is the probability that $$\frac{1}{4}{x}-{5}<{0}$$ ?(1)T is a set of 8 integers.(2)T is contained in the set of integers from 1 to 25, inclusive.
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