(1 + 3 + 5 +.......+ 2021 ) x ( 2121 x 22 -2222 x21)
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TP
0
NK
Tìm x : x + 7 \(\dfrac{4}{5}\) = 9 \(\dfrac{7}{15}\)
x - 4\(\dfrac{9}{11}\) = \(\dfrac{2121}{2222}\)
x - 4\(\dfrac{9}{11}\) = \(\dfrac{2121}{2222}\)
2
VN
Võ Ngọc Phương
VIP
18 tháng 9 2023
\(x+7\dfrac{4}{5}=9\dfrac{7}{15}\)
\(=>x+\dfrac{39}{5}=\dfrac{142}{15}\)
\(=>x=\dfrac{142}{15}-\dfrac{39}{5}=\dfrac{142}{15}-\dfrac{117}{15}\)
\(=>x=\dfrac{25}{15}=\dfrac{5}{3}\)
___________
\(x-4\dfrac{9}{11}=\dfrac{2121}{2222}\)
\(=>x-\dfrac{53}{11}=\dfrac{21}{22}\)
\(=>x=\dfrac{21}{22}+\dfrac{53}{11}=\dfrac{21}{22}+\dfrac{106}{22}\)
\(=>x=\dfrac{127}{22}\)
18 tháng 9 2023
\(x+7\dfrac{4}{5}=9\dfrac{7}{15}\)
\(x=9\dfrac{7}{15}-7\dfrac{4}{5}\)
\(x=\left(9-7\right)+\left(\dfrac{7}{15}-\dfrac{4}{5}\right)\)
\(x=2\dfrac{-1}{3}=\dfrac{5}{3}\)
\(x=\dfrac{2121:101}{2222:101}+4\dfrac{9}{11}\)
\(x=\dfrac{21}{22}+4\dfrac{18}{22}\)
\(x=\dfrac{21+4\cdot22+18}{22}=\dfrac{127}{22}\)
VT
0
VT
0
MA
18 tháng 9 2016
a ) \(x+7\frac{4}{5}=9\frac{7}{15}\)
\(x+\frac{39}{5}=\frac{142}{15}\)
\(x=\frac{142}{15}-\frac{39}{5}\)
\(x=\frac{5}{3}\)
b ) \(x-4\frac{9}{11}=\frac{2121}{2222}\)
\(x-\frac{53}{11}=\frac{21}{22}\)
\(x=\frac{21}{22}+\frac{53}{11}\)
\(x=\frac{127}{22}\)
N
1
7 tháng 12 2016
mi tích tau tau tích mi xong tau trả lời nka việt nam nói là làm
NT
2
LN
24 tháng 2 2019
\(a-68=\left(3\frac{10}{11}-4\right):\left(\frac{2121}{2222}-1\right):\left(\frac{33333}{343434}-1\right)\)
\(a-68=\left(\frac{43}{11}-4\right):\left(\frac{-1}{22}\right):\left(\frac{-310101}{343434}\right)\)
\(a-68=\frac{-1}{11}.\frac{-22}{1}.\frac{-343434}{310101}\)
\(a-68=\frac{1}{11}.\frac{22}{1}.\frac{343434}{310101}.\left(-1\right)\)
\(a-68=\frac{-686868}{310101}\)
\(a=\frac{-686868}{310101}+68\)
\(a=\frac{-20400000}{310101}\)
Vậy \(a=\frac{-20400000}{310101}\)
14 tháng 4 2017
\(x\left(\dfrac{124124}{125125}-1\right)=\dfrac{2222}{5555}:\left[\left(\dfrac{2010}{2121}-1\right):\left(\dfrac{4040}{4141}-1\right)\right]\)
\(x\left(\dfrac{124}{125}-1\right)=\dfrac{2}{5}:\left(-\dfrac{37}{707}:\dfrac{-1}{41}\right)\)
\(-\dfrac{1}{125}x=\dfrac{2}{5}:\dfrac{1517}{707}\)
\(-\dfrac{1}{125}x=\dfrac{1414}{7585}\)
\(x=\dfrac{1414}{7585}:\dfrac{-1}{125}\\ x=\dfrac{-35350}{1517}\)
S
1
17 tháng 9 2016
\(x+7\frac{4}{5}=9\frac{7}{15}\)
\(x=9\frac{7}{15}-7\frac{4}{5}\)
\(x=9\frac{7}{15}-7\frac{12}{15}\)
\(x=-2\frac{1}{3}\)
\(x-4\frac{9}{11}=\frac{2121}{2222}\)
\(x-4\frac{9}{11}=\frac{101.21}{101.22}\)
\(x-\frac{53}{11}=\frac{21}{22}\)
\(x=\frac{21}{22}+\frac{53}{11}\)
\(x=\frac{127}{22}=5\frac{17}{22}\)
Ta có: \(2121\times22-2222\times21=\left(21\times101\times22\right)-\left(22\times101\times21\right)=0\)
Do đó giá trị biểu thức đã cho là \(0\).
(1 + 3 + 5 +.......+ 2021 ) x ( 2121 x 22 -2222 x21)
(1 + 3 + 5 +.......+ 2021 ) x ( 21x101x22- 22x101x21