Đại số lớp 7
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Tìm x biết
( \(\dfrac{34}{7.13}+\dfrac{51}{13.22}+\dfrac{85}{22.37}+\dfrac{68}{37.49}+\dfrac{170}{49.79}+\dfrac{779}{79.126}\)) . x = \(\dfrac{289}{9}\)
Cho A=\(\frac{34}{7.13}+\frac{51}{13.22}+\frac{85}{22.37}+\frac{68}{37.49};\)B=\(\frac{39}{7.16}+\frac{65}{16.31}+\frac{52}{31.43}+\frac{26}{43.49}.\)Tính \(\frac{A}{B}?\)
Tìm x biết:
\(A=\dfrac{1}{21}+\dfrac{1}{28}+\dfrac{1}{36}+...+\dfrac{1}{x\left(x+1\right)}=\dfrac{2}{9}\)
VT
3 tháng 1 2022 lúc 9:01
Tìm x biết:
\(\dfrac{3}{5}\cdot\left(2x-\dfrac{1}{3}\right)+\dfrac{4}{15}=\dfrac{12}{30}\).
Tìm x biết:
a) dfrac{-32}{left(-2right)^x}4 f) left(3x-1right)^3dfrac{-8}{27}
b) left(dfrac{1}{2}right)^{2x-1}dfrac{1}{8} g) left(2x+3right)^2dfrac{9}{121}
c) dfrac{1}{9}.27^x3^x h) 5^x+5^{x+2}650
d) 9^x:3^3dfrac{1}{243} i) left(x-7right)^{x+1}-left(x-7right)0
e) dfrac{x7}{81}27...
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Tìm x biết:
a) \(\dfrac{-32}{\left(-2\right)^x}=4\) f) \(\left(3x-1\right)^3=\dfrac{-8}{27}\)
b) \(\left(\dfrac{1}{2}\right)^{2x-1}=\dfrac{1}{8}\) g) \(\left(2x+3\right)^2=\dfrac{9}{121}\)
c) \(\dfrac{1}{9}.27^x=3^x\) h) \(5^x+5^{x+2}=650\)
d) \(9^x:3^3=\dfrac{1}{243}\) i) \(\left(x-7\right)^{x+1}-\left(x-7\right)=0\)
e) \(\dfrac{x7}{81}=27\) m) \(\left(\dfrac{-3}{4}\right)^{3x-1}=\dfrac{256}{81}\)
Tìm x
1) \(\left(\dfrac{1}{16}\right)^x=\left(\dfrac{1}{8}\right)^6\) 2) \(\left(\dfrac{1}{16}\right)^x=\left(\dfrac{1}{8}\right)^{36}\) 3) \(\left(\dfrac{1}{81}\right)^x=\left(\dfrac{1}{27}\right)^4\)
4) \(\left(\dfrac{4}{9}\right)^x=\left(\dfrac{8}{27}\right)^{10}\) 5) \(2^x=4^5.4^3\) help me !!!!
Tìm x biết \(\left(1+\dfrac{1}{1.3}\right)\left(1+\dfrac{1}{2.4}\right)\left(1+\dfrac{1}{3.5}\right)...[1+\dfrac{1}{x\left(x+2\right)}]=\dfrac{4016}{2007}\)
tìm x:
\(\left(\dfrac{3}{4}x-\dfrac{9}{16}\right)\left(\dfrac{1}{3}-\dfrac{3}{5}:x\right)=0\)
Tìm x
a)left(x+5right)^3-64
b)left(2x-3right)^29
c)dfrac{x}{dfrac{4}{2}}dfrac{4}{dfrac{x}{2}}
d)dfrac{-32}{left(-2right)^n}4
e)dfrac{8}{2x}4
g)left(dfrac{1}{2}right)^{2x-1}dfrac{1}{8}
h)left(dfrac{1}{2}right)^2.xleft(dfrac{1}{2}right)^5
i) left(dfrac{-1}{3}right)xdfrac{1}{81}
Đọc tiếp
Tìm x
a)\(\left(x+5\right)^3\)=-64
b)\(\left(2x-3\right)^2\)=9
c)\(\dfrac{x}{\dfrac{4}{2}}\)=\(\dfrac{4}{\dfrac{x}{2}}\)
d)\(\dfrac{-32}{\left(-2\right)^n}\)=4
e)\(\dfrac{8}{2x}=4\)
g)\(\left(\dfrac{1}{2}\right)^{2x-1}=\dfrac{1}{8}\)
h)\(\left(\dfrac{1}{2}\right)^2.x=\left(\dfrac{1}{2}\right)^5\)
i) \(\left(\dfrac{-1}{3}\right)x=\dfrac{1}{81}\)