1. If the square of (5-3a / 4) x + 5x-3 = 0 is a one variable linear equation about X, then a= 2. Fill a conical vessel with a bottom diameter of 30 cm and a height of 8 cm with water, and then pour the water into a cylindrical vessel with a bottom diameter of 20 cm and a height of 5 cm. Will the water overflow? Why? Please use the equation to solve the problem, which can only be solved once a dollar.)

1.5-3a/4=0 a=20\3
2. Let the overflow volume be x 5 π * (20 / 2) ^ 2 + x = 8 π * (30 / 2) ^ 2 / 3, x = 100 π > 0, so it will overflow

2 math questions, and why]
(1) In 20% salt water, salt is less than water
(2) Xiaoqing's walking time from home to school has been reduced from 10 minutes to 8 minutes, and Xiaoqing's walking speed has been increased []

(1) Water: 1-20% = 80% less salt than water: (80% - 20%) / 80% = 60% / 80% = 75% (2) the original speed: 1 / 10 of the total distance per minute, the later speed:

Mathematics function geometry comprehensive problem in junior high school
As shown in the figure, it is known that P is a point on the edge OA of ∠ AOB. The two sides of ∠ MPN with P as the vertex intersect ray ob at two points m and N respectively, and ∠ MPN = ∠ AOB = a (a is the acute angle). When ∠ MPN takes point P as the rotation center, PM edge coincides with Po position, and rotates counterclockwise (PMN remains unchanged), m and N move parallel to the right at the same speed on ray ob, let om = x, on = y (Y & gt; X & gt; 0), If Sina = 3 / 2, Op = 2. (1) when ∠ MPN rotates 30 degree, i.e. ∠ OPM = 30 degree, calculate the distance of point n moving; (2) verify that △ OPN is similar to △ PMN; (3) write the relationship between Y and X; (4) write the functional relationship between S and X, and determine the value range of S

(1) It is proved that in △ OPN and △ PMN, ∠ PON = ∠ MPN = 60 °, ONP = ∠ PNM, ∧ OPN ∧ PMN; (2) ∧ Mn = on-om = Y-X, ∧ pN2 = on ∧ 8226; Mn = y (Y-X) = y2-xy.pd ⊥ ob is made through P, and D is vertical foot. In RT △ OPD, OD = op ∧ 8226; cos60 ° = 2 ×

The solution of the equation x + m / X-2 = - 1 of X is greater than 0, and the value range of M is obtained!

Is x plus M / x minus 2, or x plus x minus 2 / 2 m?

The solution of the equation x / (x + 1) - (x-1) / (X-2) = A / (X-2) of X is a negative number

First, X is not equal to - 1
Then multiply both sides by (x-x-2), simplify to 1-2x = a, and X1 and a is not equal to 3

If a = 10, B = 20, C = 1, d = 2 and E = 0 are known, please give the operation results of the following expressions respectively: 5 C / D | A / b___ 0_ ,
C language

C / D is 0 because there is or operation at the back. So if you don't operate at the back, it is 0. If you don't understand, you can continue to ask

Given that the distance between a (a, - 5) and B (0,10) is 17, find a=______ ．

The distance between point a (a, - 5) and B (0, 10) is 17, so (a − 0) 2 + (− 5 − 10) 2 = 17, the solution is a = ± 8, so the answer is: ± 8

Let a be an integer, f be a real and I be double, then what is the data type of the value of expression 10 +'I '+ I * f? Why? 3Q

Double precision operation of different data types is first converted to the highest of these data types

If int a = 10, B = 9, C; then after calculating the expression C = (a% 11) + (b = 3), C + = 2, what is the value of variable C? I hope to explain the operation process in detail

A% 11 = 10 then 3 C = 13
C + = 2 is C = C + 2
So eventually C = 15
This problem is recommended that you do not have to ask, directly run on VC
If you don't understand the process, you can use prinf to output the results of each value step by step

Several division calculation problems, everyone to help!
1. Given that four fifths of a number is one half, what is the number?
2. A number 7 and a quarter times is 3 and a half. What's the number?
How many four out of seven are there in 28?
5. What number times 9 / 20 is 45?
That's the above questions. Please write the formula while answering. Thank you!

1. Given that four fifths of a number is one half, what is the number?
1/2 / 4/5
=1/2*5/4
=5/8
2. A number 7 and a quarter times is 3 and a half. What's the number?
3 and 1 / 2 / 7 and 1 / 4
＝7/2*4/29
＝28/58
How many four out of seven are there in 28?
28/ 4/7＝49
5. What number times 9 / 20 is 45?
45/ 9/20
＝45*20/9
＝100

2 math questions, and why] (1) In 20% salt water, salt is less than water (2) Xiaoqing's walking time from home to school has been reduced from 10 minutes to 8 minutes, and Xiaoqing's walking speed has been increased []