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The diameter of a cylinder is 18cm, and the height is 15cm
Diameter 18cm, radius 9cm
The surface area is the area of his side and two bottom surfaces, his side area: 3.14 * 18 * 15 = 56.52 * 15 = 847.8 square centimeter, the area of two bottom circles = 3.14 * 9 * 9 * 2 = 508.68 square centimeter, the surface area = side area + 2 circle area = 847.8 + 508.68 = 1356.48 square centimeter
The greatest common factor of 17 out of 51 mathematical problems in Volume 2 of grade 5
17
A pair of corresponding sides of two similar triangles are 35cm and 14cm respectively, and the difference of their perimeter is 60cm, then the perimeter of the larger triangle is 60cm______ cm．
∵ two similar triangles have a pair of corresponding sides of 35cm and 14cm respectively, and the similarity ratio is 52. If the three perimeter of the larger triangle is 5x, then the smaller one is 2x. From the meaning of the title, we get that 5x-2x = 60, ∵ x = 20, so the perimeter of the larger triangle is 20 × 5 = 100cm
The greatest common factor of two numbers is 12, and the least common multiple is 60. What is the sum of these two numbers?
60÷12=5
Because 5 = 1 × 5
So these two numbers are: 1 × 12 = 12 and 5 × 12 = 60
The sum of two numbers is: 12 + 60 = 72
The tangent value of the inclination angle α of a line is called the slope of the line. What is the tangent value?
The ratio of vertical direction to horizontal direction is called tangent value
How many words are there in the first part of volume seven
A total of three units, also more than 100 bar, from the beginning of ABCD
As shown in the figure, the parabola y = 1 / 2x ^ 2 - x + a intersects with the X axis at points a and B, and intersects with the Y axis at point C, and its vertex is on the straight line y = - 2x
Vertex coordinates (1, A-1 / 2), substituting into a straight line, a = - 3 / 2, and then substituting into a parabola
Among the natural numbers larger than 2011, after being divided by 66, how many numbers have the same quotient and remainder? What is the sum of these numbers?
Among the natural numbers larger than 2011, after being divided by 66, how many numbers have the same quotient and remainder? What is the sum of these numbers?
1.70 numbers are arranged in a row. Except for the two numbers at the two ends, the three times of each number is exactly equal to the sum of the numbers on both sides. The leftmost numbers in this row are as follows: 0,1,3,8,21. How much is the leftmost number divided by 6?
2. Formula 1 × 1 + 2 × 2 + 3 × 3 + +What is the number of 120 × 120?
3. Of all the natural numbers from 1 to 2011, how many times 72 are perfect square numbers?
4. The result of adding 10 or subtracting 10 to a natural number is a complete square number
5. If 1 × 2 × 3 × X n + 3 is the square of a natural number
It's OK to answer one question
A sorry, wrong number: in the natural numbers less than 2011, after being divided by 66, how many numbers have the same quotient and remainder? What is the sum of these numbers?
66 × 30 = 19801980 + 30 = 2010 < 2011, excluding 66 × 31 = 20462046 + 31 = 207866 × 32 = 21122112 + 32 = 214466 × 33 = 21782178 + 33 = 2211 And so on, there are infinitely many, and the sum is 66 × (31 + 32 +...) +n）+（31+32+… +n) 5 (n & sup2; - 31 & sup2;) = ∞ and
In Cartesian coordinates, the polar equation of curve C is ρ = 2cos θ - 4sin θ,
The line L passing through P (2,0) intersects with circle C at two points a and B, and ab = 2. Find the polar coordinate equation of line L
C is the circle whose center (- 1,2) radius root is 5, AB length is 2, so the distance from the center to the straight line is 2
Let the line y = K (X-2), and the solution K is 0 or - 4 / 3
So the polar equation is θ = 0 (ρ∈ R) or 4 ρ cos θ + 3 ρ sin θ - 8 = 0
Factorization:
2m＾3 - 8m
（x+2）（x+4）+ x＾2 -4
4（x-y）＾2 - 2（y-x）＾3
x＾2 （y＾2 - 1）+2x（y＾2 - 1）+（y＾2 - 1）
a（x-y）-b（y-x）+c（x-y）
3 x＾3 y - 6xy + 3y
x＾3 + 6x＾2 - 27
b＾2 - 2b
a＾3-ab＾2
x＾3-6x＾2+9x
（2a-b）＾2 + 8ab
（x+2）（x+3）+ x＾2 + 4
xy-x-y+1
a＾2 - b＾2 + 4b
a＾2 - 2ab + b＾2 -1
calculation:
[1-1/（2＾2）][1-1/（3＾2）]...[1-1/（9＾2）][1-1/（10＾2）]
2010＾2 - 2009＾2 + 2008＾2 - 2007＾2 +...+ 2＾2 - 1＾2
27＾2-46*27+ 23＾2
If a ＾ 2 + B ＾ 2 + 2a-4b + 5 = 0, find the values of real numbers a and B
If nonzero real numbers a and B satisfy 4A ＾ 2 + B ＾ 2 = 4AB, then B / A=
RELATED INFORMATIONS
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- 6. If a five digit number is divided by 187 and 52, 188 and 51, what is the remainder of the natural number divided by 22?
- 7. Equation: 6x + (20-2x) times 6 + (18-x - (20-2x) times 8) = 118
- 8. The radius of circle O is 15 cm, the Xuan PQ is parallel to Mn, and PQ = 18, Mn = 24. Find the area of a trapezoid with one or two parallel Xuan as the bottom
- 9. In the circle O, if the center angle AOB is 90 ° and the distance from the point O to the chord is 5, what is the diameter and length of the circle O? In the circle O, if the center angle AOB is 90 ° and the distance from the point O to the chord is 4, what is the diameter and length of the circle O? In the circle O, if the center angle AOB is 90 ° and the distance from the point O to the chord is 5, what is the diameter and length of the circle O? It's five, not four
- 10. An intersection (- 2,0) of parabola y = x ^ 2-2x + m and X axis Then another intersection point coordinates
- 11. As shown in the figure, △ ABC, ad is the middle line on the edge of BC, f is the point on ad, AF: FD = 1:5, connects CF, and extends AB to e, then AE: EB equals () A. 1：6B. 1：8C. 1：9D. 1：10
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- 13. -1, - 3, - 5, - 7, - 9,2,4,6,8, fill in the lattice of 3 * 3, so that the product of three numbers is negative, and the sum of absolute values of three numbers is equal
- 14. The sum of 5 times of a certain number and 2 / 3 of a certain number is equal to 17
- 15. No matter m is a real number, the intersection of the line y = x + 2M and the line y = - x + 4 cannot be in the third quadrant of a and the fourth quadrant of B
- 16. X-3/7=（3X+2-53）/15
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- 19. Finding roots of cubic equation x ^ 3-3x ^ 2 + 4 = 0
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