Tính nhanh: F= (9+1)(9^2+1)(9^4+1)(9^8+1)....(9^32+1)
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Bài 1 Tính nhanh
a) -3/7 + 5/13 + 3/7
b) -5/21+-2/21+8/24
c) -5/11+(-6/11+2)
d) (-1/32+1/2)+15/32
e)5/17+ -6/13 + 3/4 + 7/-13+12/17
f) 7/23+-18/18+-4/9+16/23+-5/8
g)1/3+-3/4+3/5+-1/36+1/15+-2/9
h)-1/2+1/3+-1/4+-2/8+4/18+4/9
a)\(-\dfrac{3}{7}+\dfrac{5}{13}+\dfrac{3}{7}\)
=\(\left(-\dfrac{3}{7}+\dfrac{3}{7}\right)+\dfrac{5}{13}\)
=\(0+\dfrac{5}{13}\)
=\(\dfrac{5}{13}\)
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Tính nhanh:
a) \(1^2-2^2+3^2-4^2+5^2-6^2+...+2011^2-2012^2\)
b) \(10\left(9^2+1\right)\left(9^4+1\right)\left(9^8+1\right)\left(9^{16}+1\right)\left(9^{32}+1\right)-9^{64}\)
Tính nhanh
a) 8/3 + 17/9 + 19/13 + 1/3 + 7/13 +1/9
b)1/2 + 1/4 + 1/8 + 1/16 + 1/32
a,
\(\frac{8}{3}+\frac{17}{9}+\frac{19}{13}+\frac{1}{3}+\frac{7}{13}+\frac{1}{9}\)
\(=\left(\frac{8}{3}+\frac{1}{3}\right)+\left(\frac{17}{9}+\frac{1}{9}\right)+\left(\frac{19}{13}+\frac{7}{13}\right)\)
\(=3+2+2\)
\(=7\)
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Tính nhanh
A. 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
B. 2/1*3 + 2/3*5 + 2/5*7 + 2/7*9 + 2/9*11
tính nhanh
a) 1/2+1/4+1/8+1/16+1/32
b) 1/3+1/9+1/27+1/81+1/243+1/729
A = \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\)
2 \(\times\) A = 1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\)
2 \(\times\) A - A = 1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) - (\(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\))
A = 1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) - \(\dfrac{1}{2}\) - \(\dfrac{1}{4}\) - \(\dfrac{1}{8}\) - \(\dfrac{1}{16}\) - \(\dfrac{1}{32}\)
A = 1 - \(\dfrac{1}{32}\)
A = \(\dfrac{31}{32}\)
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B = \(\dfrac{1}{3}\) + \(\dfrac{1}{9}\) + \(\dfrac{1}{27}\) + \(\dfrac{1}{81}\) + \(\dfrac{1}{243}\) + \(\dfrac{1}{729}\)
3 \(\times\)B = 1 + \(\dfrac{1}{3}\) + \(\dfrac{1}{9}\) + \(\dfrac{1}{27}\) + \(\dfrac{1}{81}\) + \(\dfrac{1}{243}\)
3 \(\times\) B - B = 1 + \(\dfrac{1}{3}\) + \(\dfrac{1}{9}\) + \(\dfrac{1}{27}\) + \(\dfrac{1}{81}\) + \(\dfrac{1}{243}\) -(\(\dfrac{1}{3}\)+\(\dfrac{1}{9}\)+\(\dfrac{1}{27}\)+...+\(\dfrac{1}{729}\))
2B = 1 + \(\dfrac{1}{3}\) + \(\dfrac{1}{9}\) + \(\dfrac{1}{27}\) + \(\dfrac{1}{81}\) + \(\dfrac{1}{243}\) - \(\dfrac{1}{3}\) - \(\dfrac{1}{9}\)-\(\dfrac{1}{27}\)-...- \(\dfrac{1}{729}\)
2B = 1 - \(\dfrac{1}{729}\)
2B = \(\dfrac{728}{729}\)
B = \(\dfrac{728}{729}\) : 2
B = \(\dfrac{364}{729}\)
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Bài 1: tính nhanh
A, 10 - 9 + 8 - 7 + 6 - 5 + 4 - 3 + 2 -1
B, 1 +3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
Bài 2 : năm nay mẹ 29 tuổi. Đến khi mẹ 32 tuổi thì lúc đó con 9 tuổi. Hỏi năm nay con bao nhiêu tuổi?
1+8+3+9+3=
1+7+3+9+32=
4+7+2+98=
ai làm nhanh mình tick
1 + 8 + 3 + 9 + 3 = 24
1 + 7 + 3 + 9 + 32 = 52
4 + 7 + 2 + 98 = 111
:origin()/pre10/e83f/th/pre/f/2015/026/5/d/_2015_01_25__revekachibitopost_by_hyanna_natsu-d8fjo5q.png)
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So sánh
(9+1)(9^2+1)(9^4+1)(9^8+1)(9^16+1)(9^32+1) và 9^64-1
Nhờ mọi người ạ!!!!:3
Làm em tick cho^^
Ta có \(\left(9+1\right)\left(9^2+1\right)\left(9^4+1\right)\left(9^8+1\right)\left(9^{16}+1\right)\left(9^{32}+1\right)\)
\(=\frac{1}{8}\left(9-1\right)\left(9+1\right)\left(9^2+1\right)\left(9^4+1\right)\left(9^8+1\right)\left(9^{16}+1\right)\left(9^{32}+1\right)\)
\(=\frac{1}{8}\left(9^2-1\right)\left(9^2+1\right)\left(9^4+1\right)\left(9^8+1\right)\left(9^{16}+1\right)\left(9^{32}+1\right)\)
cứ như thế
\(=\frac{1}{8}\left(9^{64}-1\right)< 9^{64}-1\)=>đpcm
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Tính nhanh:
a)2+4+8+6+7+8+3+9+2+1;
b)3+2+4+9+7+1+8+6+3+5;
c)2+3+4+5+6+7+8+9+1+4.
a)2+4+8+6+7+8+3+9+2+1;
=(9+1)+(2+8)+(4+6)+(7+3)+(2+8)
=10+10+10+10+10
=10x5
=50
b)3+2+4+9+7+1+8+6+3+5
làm tương tự nhé
c)2+3+4+5+6+7+8+9+1+4.
làm tương tự nhé
P/s tham khảo nha
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a) Bạn gộp các số có tổng bằng 10 :2-8,4-6,7-3,8-2,9-1 kq50
b)c) tương tự
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a)2+4+8+6+7+8+3+9+2+1
=(2+8)+(4+6)+(7+3)+(8+2)+(9+1)
=10+10+10+10+10
=50
b)3+2+4+9+7+1+8+6+3+5
=(3+7)+(2+8)+(4+6)+(9+1)+(3+5)
=10+10+10+10+8
=48
c)2+3+4+5+6+7+8+9+1+4
=(2+8)+(3+7)+(4+6)+(9+1)+(5+4)
=10+10+10+10+9
=49
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