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There are 380 new story books and science and technology books in the school. Three fourths of the known story books are equal to five sixths of the science and technology books. How many are the two books Formula, urgent
Hello, landlord
Let the storybook be x, then the science and technology book be 380-x, then we get the equation, X * 3 / 4 = (380-x) * 5 / 6, the solution is x = 200, that is, there are 200 storybooks and 180 science and technology books
The school bought 180 story books, and gave nine fourths of them to the sixth grade, and the rest to the fifth grade. How many more story books did the fifth grade get than the sixth grade?
Nine out of four for sixth grade is four out of nine?
Grade 6, 180 * 4 / 9 = 80
Grade 5 = 180-80 = 100
Five is 20 more than six
How much process does 5 out of 6 minus 4 out of 9 plus 1 out of 6 minus 2 out of 9 mean
Draw a (2,3), B (- 3, - 2), C (4,1) three points in the plane rectangular coordinate system as shown in the figure, and connect a, B, C three points once with line segments
Can you work out its area?
That kind of root I still have to learn, can I use the seven-year knowledge to solve problems?
You complete the triangle into a large rectangle, and then subtract a few small triangles
1 in 30 + 1 in 15 is equal to?
1 / 30 + 1 / 15
=1 / 30 + 2 / 30
=3 / 30
=1 in 10
2y-6x-3 = 0 how to find the slope k and intercept B of other straight lines? Why answer 2y-6x-3 = 0, 2Y = 6x + 3, y = 3x + 1.5, slope k = 3, intercept B = 1.5
For the straight line ax + by + C = 0, if B = 0, then the slope of the straight line does not exist, and the inclination angle is 90 degrees; if B ≠ 0, then it can be written as: y = (- A / b) x-C / B, called - A / B as the slope of the straight line. For these specific linear equations, I think you can solve them by yourself
Minimum positive period of F (x) = cosx (SiNx + COS) - 1 / 2~~
f(x)=cosx(sinx+cos)*(-1/2)
It should be like this=
f(x)=cosx(sinx+cosx)*(-1/2)
=-1/2(sinxcosx+cos^2x)
=-1/4(2sinxcosx+2cos^2x-1+1)
=-1/4(sin2x+cos2x+1)
=-1 / 4 [radical 2Sin (2x + π / 4) + 1]
Therefore, the minimum positive period T = 2 π / 2 = π
If the line y = - 2x-1 intersects the line y = 3x + m in the third quadrant, please determine the value range of the real number M
Just write the answer
If the intersection is in the third quadrant, then X
It is proved that on the interval [2,5], the function f (x) = - 2x + 3x - 1 is decreasing
It's important to have an accurate and detailed process
F (x) = - 2x + 3x-1, the axis of symmetry is x = 3 / 4, the opening is downward, so (3 / 4, + ∝) is monotonically decreasing, and [2,5] is in (3 / 4, + ∝), so the function f (x) = - 2x + 3x-1 monotonically decreasing
The edge length of a cube is 2 cm of 3 × 10, and its volume is calculated
The second power of 3 × 10 is cm = 3M
So its volume is:
3x3 = 27 (M3)
RELATED INFORMATIONS
- 1. Let the definition domain of odd function f (x) be r, and the minimum positive period T = 3. If f (1) ≥ 1, f (2) = 2A − 3A + 1, then the value range of a is () A. A ＜ 1 or a ≥ 23B. A ＜ - 1C. − 1 ＜ a ≤ 23d. A ≤ 23
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- 5. What's 50 times 75? How much is 100 times 100 plus 75 times 50?
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- 12. Simple calculation 36 * 35 / 34
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