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200301
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If $$a_1$$,$$a_2$$ ,$$a_3$$ …$$a_n$$ is the sequence such that $$a_1=4$$ and $$a_n = a_{n-1}$$ for all positive integer n, what is the value of $$a_t$$ in terms of t ?
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190302
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$$t^{3}$$=3. $$t^{2}$$=?
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OG12 OG15 OG16 OG17
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When $$\frac{1}{10}$$ percent of 5,000 is subtracted from $$\frac{1}{10}$$ of 5,000, the difference is
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190215
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(n-1)!, (n+2)!,(n+1)! are all multiples of 120. What is the least value of n?
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OG12 OG15 OG16
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if x=-1,then $$\frac{x^4-x^3+x^2}{x-1}$$
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Manhattan
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Is x positive?(1) $$(x – 3)^2 > 0$$(2) $$x^3 – 1 > 0$$
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200301
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If f(x)=$$x ^ { 2 } * ( 1 - x ) ^ { 2 }$$, what is f(1-x)?
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A certain computer program generates a sequence of numbers $${a}_{1}$$, $${a}_{2}$$, ... , $${a}_{n}$$ such that $${a}_{1}={a}_{2}={1}$$ and $${a}_{k}={a}_{k-1}+{2a}_{k-2}$$ for all integers k such that $$3 \le k\le n$$. If $$n > 6$$, then $${a}_{7}=$$ ?
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From January 1, 1991, to January 1, 1993, the number of people enrolled in health maintenance organizations increased by 15 percent. The enrollment on January 1, 1993, was 45 million. How many million people, to the nearest million, were enrolled in health maintenance organizations on January 1, 1991?
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What is the value of$${1} \over{x^{2}-y^{2}} $$*$${-1}\over{x^{2}+2xy+y^{2}}$$?1.$$2y=x^{2}-y^{2}$$2.x+y=4
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What is the value of $${5}{x}^{2}+ 4x - 1$$?(1)$$x(x+2) = 0$$(2)$$x=0$$
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代数
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If x and y are positive, is $$4x>{3y}$$?(1)$$x>{y-x}$$(2)$$\frac x y<1$$
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190302
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$$a_1$$=10,$$a_{n+2}$$=$$a_{n+1}$$+$$a_n$$.$$a_4$$-$$a_3$$=?
1：$$a_5$$-$$a_4$$=21
2：$$a_2$$=11
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OG18-数学分册
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If the average (arithmetic mean) of 5 numbers j, j + 5, 2j – 1, 4j – 2, and 5j – 1 is 8, what is the value of j ?
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If water is leaking from a certain tank at a constant rate of 1,200 milliliters per hour, how many seconds does it take for 1 milliliter of water to leak from the tank?
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OG12 OG15 OG16 OG17 OG18
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If n is an integer, which of the following must be even?
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OG12
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In the xy-coordinate system, if (a,b) and (a + 3,b + k) are two points on the line defined by the equation x = 3y- 7, then k =
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190207
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|$$\frac{x^{2}}{x}$$|=? x≠ 0
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191031
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If k=0.0004, which of the following has the greatest value?
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If $${x}!=-{y}$$, is$$\frac{x-y}{x+y} >1$$(1)$$x >0$$(2)$$y<0$$
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