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Appreciating that mathematical notation presents a major roadblock to many students, some well-meaning educators (i)_____ them by (ii)_____ the use of notation; but this is an unfortunate detour, since practice with notation (iii)_____ the important skill of reasoning.
当前版本由更新于2020-04-23 17:46:47 感谢由对此题目的解答所做出的贡献。
[数学 ]经典真题240 -9194
If the perimeter of the isosceles right triangle shown is 1 + √2 , what is the area of the triangular region?
[数学 ]经典真题240 -9193
The sequence a1, a2, . . . , an, . . . is defined by a1 = 1, a2 = 1, and an = a(n-1)+a(n-2) for all integers n ≥ 3.Which of the following values are terms of the sequence? Indicate all such values.
[数学 ]经典真题240 -9192
What is the remainder when 3^35 is divided by 5?
[数学 ]经典真题240 -9191
The average (arithmetic mean) of the weights of a father and mother is twice the average of the weights of their 4 children. If the average weight of the 6 family members is 128 pounds, what is the average weight,in pounds, of the 4 children?
[数学 ]经典真题240 -9190
The dollar amount of losses due to financial fraud was what percent greater, to the nearest whole percent,than the dollar amount of losses due to virus attack?
[数学 ]经典真题240 -9189
Which of the following is closest to the amount by which the average (arithmetic mean) dollar amount of losses due to the actions cited exceeds the median dollar amount of the losses?
[数学 ]经典真题240 -9188
For the seven actions listed in the table, what is the range of the numbers of companies that cited the action?
[数学 ]经典真题240 -9187
In a group of 10 people, the median height is 70 inches, the average (arithmetic mean) height is 70.5 inches, and the range of the heights is 12 inches. If an additional person who is 74 inches tall joins the group, which of the three statistics must change?
[数学 ]经典真题240 -9186
P=23^25-23. What is the units digit of P?
[数学 ]经典真题240 -9185
The weekly sales commission at Company X is 2 percent of the first $2,000 of weekly sales plus 15 percent of the weekly sales in excess of the first $2,000. The weekly sales commission at Company Y is 5 percent of the first $2,000 of weekly sales plus 10 percent of the weekly sales in excess of the first $2,000. In a given week, what is the amount of weekly sales at Company Y that would earn the same weekly sales commission as $5,000 in weekly sales at Company X?
[数学 ]经典真题240 -9184
The arithmetic mean of the five numbers x+6, 2x-3, 2x+2, 3x-5, and 4x-4 is 4. What is the range of the five numbers?
[数学 ]经典真题240 -9183
The operation ⊗ is defined by x ⊗ y =(x^2)/y +x/y for all numbers x and y, where y ≠0. What is the value of (9 ⊗ ( 9)) + (( -9) ⊗ 9)?
[数学 ]经典真题240 -9182
The table shows the linear relationship between the stride rate of a runner, in numbers of strides per second, and the speed index. This linear relationship holds for stride rates per second to 5.00 strides per second. According to this linear relationship, what is the speed index when the runner with a stride rate of 3.80 strides per second?
[数学 ]经典真题240 -9181
4 < x < y < 8 The ratio of x to y is 4 to 7.
[数学 ]经典真题240 -9180
In the figure, line segments RM, SM, and TM bisect the angles of △RST.
[数学 ]经典真题240 -9179
The area of region PQR is 15.
[数学 ]经典真题240 -9178
n is an integer greater than or equal to 5.
[数学 ]经典真题240 -9177
In 1998 the yearly expenses to run a certain small business were x dollars. In 1999 the yearly expenses to run the business increased by 10 percent of the 1998 yearly expenses. In 2000 the yearly expenses decreased by 5 percent of the 1999 yearly expenses.
[数学 ]经典真题240 -9176
[数学 ]经典真题240 -9175
The sum of n integers, n ≠0, is R.