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Cristiano Ronaldo 03/08/2018 at 14:18Your body is old in bamboo
Winter re-open summer.
What is the trick?Answer: That is a fan
Face586 selected this answer.
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Nguyễn Việt Hoàng 21/03/2017 at 17:22We have : \(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+.......+\dfrac{1}{99.101}\)
\(=\dfrac{1}{2}\left(\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+.......+\dfrac{2}{99.101}\right)\)
\(=\dfrac{1}{2}\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+......+\dfrac{1}{99}-\dfrac{1}{101}\right)\)
\(=\dfrac{1}{2}\left(1-\dfrac{1}{101}\right)\)
\(=\dfrac{1}{2}.\dfrac{100}{101}\)
\(=\dfrac{50}{101}\)
Nếu Có Thể selected this answer. -
→இے๖ۣۜQuỳnh 22/03/2017 at 20:14- Profile
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Answers ( 115 )- See question detail
We have : x < -0.8 ⇒ x + 0,8 < 0 ⇒|x + 0.8| = -(x + 0.8)
x < -0.8 ⇒ x < 25 ⇒ |x - 25| = 25 - x
Candle A = -(x + 0.8) - (25 - x) + 1.9
= -x + 0,8 - 25 + x + 1,9
= -x + x - 0,8 - 25 + 1,9
= -25,8 + 1,9
A = -23,8
A = -x - 0.8 - 25 + x + 1.9
A = -23.9
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EDM Sang copy my post you review time go
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Nguyễn Xuân Sáng you never copy my name again
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Thanks You Nếu Có Thể
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Put A = 1.2 + 2.3 + 3.4 + ....... + 199.200
=> 3A = 1.2.3 - 1.2.3 + 2.3.4 - 2.3.4 + ....... + 199.200.201
=> 3A = 199.200.201
=> A = 199.200.201/3
=> A = 2666600
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That worker makes 3 tools out of time is:
12 hours - 7 hours 30 minute = 4 hours 30 minute = 4,5 hours
The worker makes 1 product time out is :
4,5 : 3 = 1,5 (hours)
Answer : 1,5 hours
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That worker makes 3 tools out of time is:
12 hours - 7 hours 30 minute = 4 hours 30 minute = 4,5 hours
The worker makes a product time out is :
4,5 : 3 = 1,5 (hours)
Answer : 1,5 hours
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Land : A = 1.3 + 3.5 + 5.7 + ...... + 99.101
=> 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)
=> 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101
=> 4A = 99.100.101
=> A = 99.100.101/4
=> A = 249975
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From 7m + 5n = 31, we can see that 7m or 5n is even.
- If 7m is even, m is even and prime => m = 2.
=> 5n = 31 - 7 x 2 = 17. n ⋮̸⋮̸ 5, so no numbers sastify the problem.
- If 5n is even, n is even and prime => n = 2.
=> 7m = 31 - 5 x 2 = 21 => m = 3 is a prime number.
The value of: mn + nm = 32 + 23 = 9 + 8 = 17.
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Land A = 1.2 + 2.3 + 3.4 + ....... + 199.200
=> 3A = 1.2.3 - 1.2.3 + 2.3.4 - 2.3.4 + ....... + 199.200.201
=> 3A = 199.200.201
=> A = 199.200.201/3
=> A = 2666600
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We have : 11.3+13.5+15.7+.......+199.10111.3+13.5+15.7+.......+199.101
=12(21.3+23.5+25.7+.......+299.101)=12(21.3+23.5+25.7+.......+299.101)
=12(1−13+13−15+......+199−1101)=12(1−13+13−15+......+199−1101)
=12(1−1101)=12(1−1101)
=12.100101=12.100101
=50101
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Nguyễn Xuân Sáng 21/03/2017 at 20:49We have:
\(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+...+\dfrac{1}{99.101}\)
\(=\dfrac{2.1}{2.1.3}+\dfrac{2.1}{2.3.5}+\dfrac{2.1}{2.5.7}+...+\dfrac{2.1}{2.99.101}\)
\(=\dfrac{1}{2}.\left(\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{99.101}\right)\)
\(=\dfrac{1}{2}.\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{99}-\dfrac{1}{101}\right)\)
\(=\dfrac{1}{2}.\left(1-\dfrac{1}{101}\right)\)
\(=\dfrac{1}{2}.\dfrac{100}{101}\)
\(=\dfrac{50}{101}\)
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♫ ♪ ♥► EDM Troop ◄♥ ♪ ♫ 13/04/2017 at 17:48Suppose there are \(a\) values of y = \(k\) satisfy the equation above.
When k is satisfied the equation, -k is also satisfied the equation, because \(y^4=k^4=\left(-k\right)^4\)
So the sum of all values of y is \(a.k+a.\left(-k\right)=0\)
Ans : 0.
John selected this answer.
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n lines make \(\dfrac{n\left(n-1\right)}{2}\)intersections at the most
Bùi Vân selected this answer.
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Convert : 2 feet 7 inches = 31 inches ; 3 feet = 36 inches
The positive diference between Bailey's estimate and the actual volume is :
363 - 313 = 46656 - 29791 = 16865 (cubic feet)
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Convert: 1 feet = 12 inches
The differance between the measure of Balley and the actual size is: \(3ft-2ft7inch=5inches\)
So the positive differance is: \(5.5.5=125\left(cubic-inches\right)\)
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VTK-VangTrangKhuyet 29/08/2017 at 20:56Using Bunhiakovski's inequaility :
\(\left(1\cdot\sqrt{4a+1}+1\cdot\sqrt{4b+1}\right)^2\le\left(1^2+1^2\right)\cdot\left(4a+1+4b+1\right)=2\cdot6=12\)
=> \(\sqrt{4a+1}+\sqrt{4b+1}\le\sqrt{12}\)
The "=" happens when a = b = \(\dfrac{1}{2}\)
Vương Ngọc Như Quỳnh selected this answer.
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Let x be the least number of members in the band, then x is divided by 3, 5, 7, 9 with remainders 1, 2, 3, 4 respecitvely.
Since 3 = 1.2 + 1 ; 5 = 2.2 + 1 ; 7 = 3.2 + 1 ; 9 = 4.2 + 1,
2x + 1 is divisible by 3 ; 5 ; 7 ; 9.
So, 2x + 1 = LCM(3,5,7,9) = 315 or x = 157
Hence, the answer is 157
We need to
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→இے๖ۣۜBoy™†hïếuGîa 16/09/2017 at 13:39
Let x be the least number of members in the band, then x is divided by 3, 5, 7, 9 with remainders 1, 2, 3, 4 respecitvely.
Since 3 = 1.2 + 1 ; 5 = 2.2 + 1 ; 7 = 3.2 + 1 ; 9 = 4.2 + 1,
2x + 1 is divisible by 3 ; 5 ; 7 ; 9.
So, 2x + 1 = LCM(3,5,7,9) = 315 or x = 157
Hence, the answer is 157
We need to
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In ΔABC, shown here, the measure of angle BCA is 90°, AC = 12 units and BC = 9 units.
If D is a point on hypotenuse AB , such that AD = 5 units, what is the length of
segment CD? Express your answer in simplest radical form.
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\(\dfrac{x+y}{2}=12\Leftrightarrow x+y=24\Rightarrow x=24-y\)
\(\dfrac{y+12}{2}=\dfrac{z}{2}\Leftrightarrow y+12=z\)
=> \(\dfrac{x+z}{2}=\dfrac{24-y+y+12}{2}=\dfrac{36}{2}=18\)
So the mean of x and z is 18
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