Tính nhanh :
A. 1/21 + 2/21 + 3/21 + 4/21...+ 19/21 + 20/21
B. 3/7 + 4/19 + 7/11 + 15/11 + 15/19 + 4/7
K
Khách
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Những câu hỏi liên quan
1 tháng 7 2021
14) \(\sqrt{7-4\sqrt{3}}=2-\sqrt{3}\)
15) \(\sqrt{8+2\sqrt{15}}=\sqrt{5}+\sqrt{3}\)
16) \(\sqrt{10-2\sqrt{21}}=\sqrt{7}-\sqrt{3}\)
17) \(\sqrt{11+2\sqrt{18}}=3+\sqrt{2}\)
18) \(\sqrt{7+2\sqrt{10}}=\sqrt{5}+\sqrt{2}\)
19) \(\sqrt{7+4\sqrt{3}}=2+\sqrt{3}\)
20) \(\sqrt{12-2\sqrt{35}}=\sqrt{7}-\sqrt{5}\)
20 tháng 9 2023
a. ( 23 - 21) + ( 19 - 17) + ( 15 - 13) + ( 11 - 9) + ( 7 - 5) + ( 3 - 1)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
b. ( 24 - 22 ) + ( 20 - 18 ) + ( 16 - 14 ) + ( 12 - 10) + ( 8 - 6 ) + ( 4 - 2)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
NH
18
28 tháng 12 2018
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21=231
N
28 tháng 12 2018
trả lời:
=231
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ND
8
24 tháng 7 2015
(1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20)*(21*4+6-84)=330
TA
2
15 tháng 10 2017
\(\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{19}{34}-\dfrac{3}{1}+\dfrac{7}{21}+2\)
\(=\left(\dfrac{15}{34}+\dfrac{19}{34}\right)+\left(\dfrac{7}{21}+\dfrac{7}{21}\right)-\left(3-2\right)\)
\(=1-1+\dfrac{14}{21}\)
\(=\dfrac{14}{21}\)
15 tháng 10 2017
\(\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{19}{34}-3+\dfrac{7}{21}+2\)
= \(\dfrac{15}{34}+\dfrac{19}{34}+\dfrac{7}{21}+\dfrac{7}{21}-3+2\)
= \(\left(\dfrac{15}{34}+\dfrac{19}{34}\right)+\left(\dfrac{7}{21}+\dfrac{7}{21}\right)-\left(3-2\right)\)
= \(1+\dfrac{2}{3}-1\)
= \(1-1+\dfrac{2}{3}\)
= \(\dfrac{2}{3}\)
GOOD LUCK!
NX
3
23 tháng 2 2016
1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20+21 = 11
23 tháng 2 2016
1-2+3-4+.............+19-20+21
=(1-2)+(3-4)+...........+(19-20)+21
=(-1)+(-1)+............+(-1)+21{có 10 số -1)
=(-1).10+21
=(-10)+21
=11
A. Dãy số có số số hạng là
( 20/21 - 1/21) :1/21 + 1 = 20
Tổng dãy trên là
( 1/21 + 20/21) x 20 : 2 = 10
B. 3/7 + 4/19 + 7/11 + 15/11 + 15/19 + 4/7
= 4