x/6+x/10+x/15+x/21+x/28+x/36=8/9
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VQ
3
OY
31 tháng 5 2021
x.(\(\dfrac{1}{6}\)+\(\dfrac{1}{10}\)+\(\dfrac{1}{15}\)+\(\dfrac{1}{21}\)+\(\dfrac{1}{28}\)+\(\dfrac{1}{36}\)+\(\dfrac{1}{45}\)+\(\dfrac{1}{55}\)+\(\dfrac{1}{66}\)+\(\dfrac{1}{78}\))=\(\dfrac{220}{39}\)
x.\(\dfrac{20}{39}\)=\(\dfrac{220}{39}\)
x=\(\dfrac{220}{39}\):\(\dfrac{20}{39}\)
x=11
DH
2
19 tháng 4 2017
x.(1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+1/78)=220/39
x.20/39=220/39
x=220/39:20/39
x=11
NT
0
PT
1
22 tháng 4 2018
(x/6+x/10+...+x/66+x/78)*2=220/39*2
x/12+x/20+...x/132+x/156=440/39
x/2-x/3+x/3-x/4+...+x/11-x/12+x/12-x/13=440/39
x/2-x/13=440/39
11x/26=440/39
33x/78=880/78
33x=880
x=880/33
x=80/3=26, (6)
TN
11 tháng 3 2016
( x + 1 ) + ( x + 4 ) + ( x + 7 ) + ......... + ( x + 28 ) = 155
<=>(x+x+x...+x)+(1+4+...+28)=155
=>10x+145=155
=>10x=155-145
=>10x=10
=>x=1
DD
0
21 tháng 8 2019
\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{39}=\frac{8}{9}.\)
\(\Rightarrow x.\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{1}{39}\right)=\frac{8}{9}\)
\(\Rightarrow x.\frac{23}{52}=\frac{8}{9}\)
\(\Rightarrow x=\frac{426}{207}\)
Study well
21 tháng 8 2019
\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{39}=\frac{8}{9}\)
<=> x\(\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{x}{39}\right)=\frac{8}{9}\)
<=> x = \(\frac{8}{9}:\frac{23}{52}\)
<=> x = \(\frac{416}{207}\)
nhân 1/2 cả 2 vế PT:
bạn tự làm típ nha
\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{36}=\frac{8}{9}\)
\(\Leftrightarrow\frac{x}{12}+\frac{x}{20}+\frac{x}{30}+\frac{x}{42}+\frac{x}{56}+\frac{x}{72}=\frac{8}{18}=\frac{4}{9}\)
\(\Leftrightarrow\frac{x}{3.4}+\frac{x}{4.5}+\frac{x}{5.6}+\frac{x}{6.7}+\frac{x}{7.8}+\frac{x}{8.9}=\frac{4}{9}\)
\(\Leftrightarrow\frac{x}{3}-\frac{x}{4}+\frac{x}{4}-\frac{x}{5}+\frac{x}{5}-\frac{x}{6}+...+\frac{x}{8}-\frac{x}{9}=\frac{4}{9}\)
\(\Leftrightarrow\frac{x}{3}-\frac{x}{9}=\frac{4}{9}\Leftrightarrow\frac{2x}{9}=\frac{4}{9}\Leftrightarrow x=2\)