Solution equation: (2 / 3x + 5) = (3 / 2x-1)

Solution equation: (2 / 3x + 5) = (3 / 2x-1)

Multiply it by six
6x-30=4x-6
2x=24
x=12

How to solve 2x + 25 = 3x-14

If 2x is subtracted from both sides, the original formula is 25 = x-14
∴X=39

Is zero the smallest natural number, positive integer, rational number or both positive and negative

The first is correct, and the second should be 0, which is neither positive nor negative

The first row is 1, the second row is 2 3, the third row is 4 5 6, and the fourth row is 7 8 9 10. Which row is 2009?

The number J in row I is 1 + 2 +.. + I-1 + J = (1 + i-1) * (i-1) / 2 + J = I * (i-1) / 2 + J; therefore, it is to find a solution satisfying I * (i-1) / 2 + J = 2009

The following three numbers all represent six digits, where n represents 0 and M represents any natural number from 1 to 9. Then the number that must be divisible by 3 and 5 at the same time is ()
A.mmnmmn B.mnnmnn C.mnmnmn D.mnnnnn

C

What is the difference of 5 to the power of 2010 minus 1 divided by 4?
（5^2010-1)/4=?

What is the remainder
Expand with binomial theorem
(5 ^ 2010-1) / 4 = [(4 + 1) ^ 2010-1] / 4 =. The remainder is 0

What is the next letter Z, x, u, Q, l

F
In alphabetical order
There is a letter between Z and X
There are two letters between X and U
There are three letters between u and Q
There are four letters between Q and L
And so on, there are five letters between L and the next letter, which is f

It is known that the line y = KX-5 (k is not equal to 0) passes through points a (2,4) and B (0, - 2)
Point C is on the x-axis, and the angle ACB is 90 degrees
Wrong title, y = KX + B. use the method I learned in grade one or grade two

Let C (a, 0) so the slope of ca be: (4-0) / (2-A) so the slope of CB be: (- 2-0) / (0-A) (I seem to have learned the slope in junior high school, that is, the slope of a straight line is K in the linear equation y = KX + B, if we know the two points (a, b), (C, d), then k = (D-B) / (C-A), where C ≠ a) Ca is perpendicular to CB, so [4 / (2-A)] [2 / a

Rational number operation in the first winter vacation of junior high school
During the winter vacation of the first day of junior high school, there are two rational number operations, one variable equation and simplified evaluation
Prawns, please give me the whole body of winter vacation. The faster, the more accurate, the better. The difficulty is medium. The rational number operation should not be too simple, and the equation should not be too simple. At least, which type of mixed operation is it
Thank you~~~~~~~~~~~
OK, add points
Winter vacation is 19 days in total, 19 "rational number operation two, one variable equation two, simplified evaluation two" can not answer

Rational number operation: (- 0.8) + 1.2 + (- 0.7) + (- 2.1) + 0.8 + 3.5
Answer: one and three fifths
Univariate linear equation: 7 (2x-1) - 3 (4x-1) = 5 (3x + 2) - 1
Answer: x = - 1
Simplified evaluation: 5 (3x square y-xy Square) - (XY square + 3x square y) where x = 1 / 2, y = - 1
Answer: - 6

Mode, median, mean
Uncle Zhang planted 50 apple trees on the mountain. During the harvest, he randomly collected the apples from five trees. The weight of the apples harvested from each tree was as follows [unit: kg]
35,34,35,39,37
1. How many kilos of apples are harvested per tree?
2. How many kilograms of apples can these 50 apple trees harvest?

1、（35+34+35+39+37）/5=36
2、36/5*50=360