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3 out of 7 = 9 * () = a * () [A is a non-zero natural number]
3 / 7 = 9 * (1 / 21) = a * (3 / 7a)
In 1, 7 / 3, 4.5, 0, - 5, 3 / 4, - 1, 19, - 2.3, 106, 0.98, 2 / 5, integers have () negative numbers have (), natural numbers ()
（1 0 -5 -1 19 106 ） （-5 -1 -2.3 -2/5）(1 19 106)
Find the rules and fill in the numbers - 23, - 18, - 13 () (?)
-8,-3
Add 5 at a time
Use the nine numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 to form prime numbers. If each number has to be used and can only be used once, how many prime numbers can these nine numbers form at most?
Can be composed of the following prime numbers: 2, 5, 7, 61, 43, 89, a total of 6. A: then these 9 numbers can be composed of up to 6 prime numbers
For any real number AB, definition: F (a, b) = 1 / 2 (a + B - | A-B |), if function f (x) = x ^ 2, G (x) = 5 / 2x + 3 / 2, H (x) = - x + 2, then function G (x) = f ((f (x), G (x)), H (x)), find the maximum value of H (x)
Directly substitute f (x), G (x) into f (a, b) to get g (x) = 1 / 2 (- x ^ 2 + 2x + 3 + X + 1 - | - x ^ 2 + 2x + 3-x-1 |) to simplify g (x) = 1 / 2 (- x ^ 2 + 3x + 4 - | - x ^ 2 + X + 2 |) if the absolute value is positive, that is - x ^ 2 + X + 2 > 0 = = = > 2 > x > - 1, then G (x) = x + 1 = = = > G (x) 0 = = > X2, then G (x) = - x ^ 2 + 2x + 3 = - (x-1) ^ 2 + 4 = =
10 1 9 8 11 7 ...What comes next?It's?
I don't know the meaning of this English intelligence problem
I don't know
But I've seen this topic:
10 1 9 6 8 11 7 ...What comes next?It's?
Maybe the landlord lost a number 6?
Odd digits: 10,9,8,7
Even digits: 1,6,11
The next number should be 16, which is 5 bits larger than the previous even number
(Z & # 178; + 1) &# 178; - 4Z (Z & # 178; + 1) + 4Z & # 178; how to calculate the factorization,
=【（z²+1）-2z】²
=（z²-2z+1）²
=【（z-1）²】²
=（z-1）⁴
On the application of quadratic equation of one variable
Given that a, B and C are all real numbers and A-2 + | B + 1 | + (c + 3) & sup2; = 0 under the root sign, find the root of the equation AX & sup2; + BX + C = 0. (Note: only A-2 is under the root sign.)
Because the numbers under the root sign are all greater than or equal to 0
The absolute value of a number is also greater than or equal to 0
The square of a number is also greater than or equal to 0
So the equal sign holds only when a - 2 = 0, B + 1 = 0, C + 3 = 0
So a = 2, B = - 1, C = - 3
So ax & # 178; + BX + C = 0, the equation is 2x & # 178; - X - 3 = 0
2x² - x - 3 = 0
(2x - 3)(x + 1) = 0
X = - 1 or x = 3 / 2
The volume of a swimming pool is 2000 ml
No, 2000 ml, just two glasses of water,
Simple calculation of 1000 * 0.4 * 1.25/8/2.5
1000*(0.4*1.25)/(8*2.5)
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