The solution of equation 1, square of X + 2x-3 = 0 2, square of X + 6x + 7 = 0 3, square of X + X-1 = 0 4, square of X + 8x + 9 = 0 5 solve equations ① And the square of X + 2x-3 = 0 ② The square of X + 6x + 7 = 0 ③ The square of X + X-1 = 0 ④ And the square of X + 8x + 9 = 0 ⑤ The square of. X-3x-1 = 0 ⑥ . x squared - 12x = - 12 ⑦ Square of. X + 4x + 1 = 0 ⑧ The square of. X - X-6 = 0

The solution of equation 1, square of X + 2x-3 = 0 2, square of X + 6x + 7 = 0 3, square of X + X-1 = 0 4, square of X + 8x + 9 = 0 5 solve equations ① And the square of X + 2x-3 = 0 ② The square of X + 6x + 7 = 0 ③ The square of X + X-1 = 0 ④ And the square of X + 8x + 9 = 0 ⑤ The square of. X-3x-1 = 0 ⑥ . x squared - 12x = - 12 ⑦ Square of. X + 4x + 1 = 0 ⑧ The square of. X - X-6 = 0

① The square of X + 2x-3 = 0 (x + 1) ^ 2 = 4x + 1 + soil 2x1 = 1 x2 = - 3 ②, the square of X + 6x + 7 = 0 (x + 3) ^ 2 = 2x + 3 = soil √ 2x1 = - 3 + √ 2 x2 = - 3 - √ 2 ③, the square of X + X-1 = 0 (x + 1 / 2) ^ 2 = 1 + 1 / 4 = 5 / 4x + 1 / 2 = ± √ 5 / 2x1 = - 1 / 2 + √ 5 / 2 x2 = - 1 / 2 - √ 5 / 2 ④, the square of X + 8x + 9 = 0

Formula method for solving equation 6x square = 3-5X
6X square = 3-5X

6x²=3-5x
6x²+5x-3=0
x²+5x/6=1/2
x²+5x/6+(5/12)²=1/2+(5/12)²
(x+5/12)²=1/2+25/144=97/144
x+5/12=±√(97)/12
x=±√(97)/12-5/12

Party A and Party B work together to make a batch of parts and complete the task within 24 days. It is known that Party A makes 5 more parts per day than Party B, and asks for 9 days' leave in the middle of the day, so Party B completes the right number of parts
It's half of A. what's the total number of these parts?
(solution of equation)

450 pieces

Solve the equation 5-5 / 6x = 1 / 3 x-3 / 8x-2 / 8x = 15 2x + 5 (30-x) = 99

5-5/6X=1/3
5/6X=5-1/3
5/6X=14/3
X=14/3÷5/6
X=28/5
X=5.6
X-3/8X-2/8X=15
(1-3/8-2/8)X=15
3/5X=15
X=15÷3/5
X=25
2X+5（30-X）=99
2X+150-5X=99
5X-2X=150-99
3X=51
X=51÷3
X=17

In the two warehouses, a's grain storage is three times that of B. even if 80 tons are transported from a to B, a still has 30 tons more than B?
List the equations

Suppose B has x tons and a has 3x tons
3X-80=X+80+30
3X-80=X+110
2X=190
X=95
B = 95 tons
A = 95 * 3 = 285 tons

0.7x + 5 + 25 = 37, solve the equation, find the big God

10

Mathematical problem equation calculation
The disposable income of Xiaoming family in 2005 was 7.5 times of that in 1995, 39000 yuan more than that in 1995. How many yuan were the disposable income of Xiaoming family in 1995 and 2005?
Square calculation

Let the disposable income in 1995 be X
Then 7.5x-x = 3.9

If S3 = 2, s (3n) = 14, then s (4N) is equal to?

The sum of the first n terms of an equal ratio sequence is also equal ratio

500 students stand in a row and count "1, 2, 3" from left to right. Those who report to 1 and 2 leave the team, those who report to 3 stay, and repeat the same counting process from left to right. After several times of doing so, there are only two students left. These two students are in the second place from left to right in the beginning of the team______ One

The numbers of these people from left to right are 1-500. Since the numbers from left to right are 1-3, those who report to 3 will be left with a multiple of 3 after the first report, and those who leave after the second report will be left with a multiple of 32, 243 = 35486 = 2 × 35, which are the two numbers with the most factor of 3 in 1-500. Therefore, the last person who leaves at the beginning is the eighth and 486 from left to right 243、486．

ABCD is a four digit natural number, known as abcd-abc-ab-a = 1995, try to determine the four digit ABCD?

This formula is simplified to abcd-abc-ab-a = 1995, that is 889a + 89B + 9C + D = 1995, ∵ 889 × 1 and 889 × 2 are less than 1995, that is, a can take 1 or 2. When a = 1, 89B + 9C + D = 1995-889 = 1106. At this time, if B, C and d take the maximum value of 9, that is 89 × 9 + 9 × 9 + 9 = 891 ∵ 1106 ∵ a cannot take 1, then a = 2 89B + 9C + D = 1995-889 × 2 = 217, B can also take 1 or 2 (because 89 × 1 and 89 × 2 are less than 217), but when B takes 1, 9C + D = 128, if B and C take 9, then 9 × 9 + 9 = 90 ＜ 128, when B takes 2, then 9C + D = 39, 9C can take 1, 2, 3, 4, ∵ D maximum is 9, ∵ 9C minimum is 30, but C is a natural number, ∵ C = 4, so d = 3, ∵ ABCD = 2243