Violympic toán 7
Các câu hỏi tương tự
Bài 1: tính
a) dfrac{13}{32}+dfrac{8}{24}+dfrac{19}{32}+dfrac{2}{3}
b)dfrac{3}{4}.36dfrac{1}{5}-dfrac{3}{4}.2dfrac{1}{5}
c) 3^4:3.dfrac{1}{27}
d) 0,1.sqrt{225}-sqrt{dfrac{1}{4}}
Bài 2: Tìm x
a) dfrac{9}{5}.xdfrac{27}{10}
b)|x|+1,253
c) left(2-xright)^325
d) 3^{x-1}+5.3^{x-1}162
Bài 3: tìm x,y biết
|x+5|+left(3y-4right)^{2018}0
Bài 4: so sánh
13 và sqrt{170}
Đọc tiếp
Bài 1: tính
a) \(\dfrac{13}{32}+\dfrac{8}{24}+\dfrac{19}{32}+\dfrac{2}{3}\)
b)\(\dfrac{3}{4}.36\dfrac{1}{5}-\dfrac{3}{4}.2\dfrac{1}{5}\)
c) \(3^4:3.\dfrac{1}{27}\)
d) \(0,1.\sqrt{225}-\sqrt{\dfrac{1}{4}}\)
Bài 2: Tìm x
a) \(\dfrac{9}{5}.x=\dfrac{27}{10}\)
b)\(|x|+1,25=3\)
c) \(\left(2-x\right)^3=25\)
d) \(3^{x-1}+5.3^{x-1}=162\)
Bài 3: tìm x,y biết
\(|x+5|+\left(3y-4\right)^{2018}=0\)
Bài 4: so sánh
\(13\) và \(\sqrt{170}\)
tìm x , biết :
a, dfrac{37-x}{2x+5}dfrac{4}{9}
b, dfrac{x-2}{x-1}dfrac{x+4}{x+7}
c, dfrac{x+3}{25}dfrac{9}{x+3}
d, dfrac{x}{dfrac{-2}{3}}dfrac{5}{-x}
e, dfrac{2x-5}{dfrac{3}{2}}dfrac{dfrac{-27}{8}}{5-2x}
f, dfrac{dfrac{5}{9}}{left(3x-1right)^2}dfrac{1-2x}{dfrac{25}{3}}
Đọc tiếp
tìm x , biết :
a, \(\dfrac{37-x}{2x+5}=\dfrac{4}{9}\)
b, \(\dfrac{x-2}{x-1}=\dfrac{x+4}{x+7}\)
c, \(\dfrac{x+3}{25}=\dfrac{9}{x+3}\)
d, \(\dfrac{x}{\dfrac{-2}{3}}=\dfrac{5}{-x}\)
e, \(\dfrac{2x-5}{\dfrac{3}{2}}=\dfrac{\dfrac{-27}{8}}{5-2x}\)
f, \(\dfrac{\dfrac{5}{9}}{\left(3x-1\right)^2}=\dfrac{1-2x}{\dfrac{25}{3}}\)
Bài 2: Tìm x:a)dfrac{x-1}{27}dfrac{-3}{1-x} c)3times x2times y vàx-2times y8b)dfrac{4}{5}-left|x-dfrac{1}{2}right|dfrac{3}{4} d)dfrac{x-1}{2005}dfrac{3-y}{2006} và x-4009y
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Bài 2: Tìm x:
a)\(\dfrac{x-1}{27}\)=\(\dfrac{-3}{1-x}\) c)\(3\times x=2\times y\) và\(x-2\times y=8\)
b)\(\dfrac{4}{5}\)-\(\left|x-\dfrac{1}{2}\right|\)=\(\dfrac{3}{4}\) d)\(\dfrac{x-1}{2005}\)=\(\dfrac{3-y}{2006}\) và x-4009=y
Tìm x biết:
a, 5x+2>3x-1
b, \(\dfrac{3}{4}.x-\dfrac{1}{2}>\dfrac{1}{2}.x+\dfrac{3}{4}\)
c, (x-2).(x-3)>0
d, (2x+4)(x-5)<0
Tìm x:
a)\(-3\dfrac{x}{2}-1\dfrac{1}{2}=2\)
b)\(\dfrac{x+1}{2}=\dfrac{8}{x+1}\)
c)\(\dfrac{x-2}{27}+\dfrac{x-3}{26}+\dfrac{x-4}{25}+\dfrac{x-5}{24}+\dfrac{x-44}{5}=1\)
HELP ME!!!!!! Mk ko bít lm???
1)Thực hiện phép tính
a) dfrac{9^8cdot5^6}{3^7cdot27^3cdot25^4} b) dfrac{5^{20}cdot6^{18}}{15^{20}cdot4^{10}} c) left(dfrac{1}{3}right)^{50}cdot9^{25}-left(dfrac{2}{3}right)^{100}:left(dfrac{8}{27}right)^{33} d) left(dfrac{3}{8}right)^{60}cdotleft(dfrac{2}{3}right)^{60}:left(dfrac{1}{2}right)^{119}cdotleft(dfrac{1}{2}right)
2) Tìm x, biết:
a) dfrac{x}{12}dfrac{5}{x} b)8^x2^{2x+3} c)dfrac{1}{2}sqrt{dfrac{1}{2}x-2}-dfrac{2}{3}dfrac{1}{3}
Đọc tiếp
1)Thực hiện phép tính
a) \(\dfrac{9^8\cdot5^6}{3^7\cdot27^3\cdot25^4}\) b) \(\dfrac{5^{20}\cdot6^{18}}{15^{20}\cdot4^{10}}\) c) \(\left(\dfrac{1}{3}\right)^{50}\cdot9^{25}-\left(\dfrac{2}{3}\right)^{100}:\left(\dfrac{8}{27}\right)^{33}\) d) \(\left(\dfrac{3}{8}\right)^{60}\cdot\left(\dfrac{2}{3}\right)^{60}:\left(\dfrac{1}{2}\right)^{119}\cdot\left(\dfrac{1}{2}\right)\)
2) Tìm x, biết:
a) \(\dfrac{x}{12}=\dfrac{5}{x}\) b)\(8^x=2^{2x+3}\) c)\(\dfrac{1}{2}\sqrt{\dfrac{1}{2}x-2}-\dfrac{2}{3}=\dfrac{1}{3}\)
Tìm x :
a) \(3^{x+1}+2x.3^x-18x-27=0\)
b) \(\dfrac{1}{2}\left|2x+5\right|-\dfrac{5}{4}\left|4x+10\right|+\dfrac{7}{3}\left|-20-8x\right|=\dfrac{1}{6}\)
tìm x
a, dfrac{x}{12} - dfrac{5}{6} dfrac{1}{12}
b, dfrac{2}{3} - 1dfrac{4}{15}x dfrac{-3}{5}
c, dfrac{left(-3right)^x}{81} -27
d, 2^{x-1} 16
e, left(x-1right)^2 25
g, left(3x-dfrac{1}{4}right).left(x+dfrac{1}{2}right) 0
Đọc tiếp
tìm x
a, \(\dfrac{x}{12}\) - \(\dfrac{5}{6}\) = \(\dfrac{1}{12}\)
b, \(\dfrac{2}{3}\) - 1\(\dfrac{4}{15}\)x = \(\dfrac{-3}{5}\)
c, \(\dfrac{\left(-3\right)^x}{81}\) = -27
d, \(2^{x-1}\) = 16
e, \(\left(x-1\right)^2\) = 25
g, \(\left(3x-\dfrac{1}{4}\right).\left(x+\dfrac{1}{2}\right)\) = 0
tim x:
a, \(\dfrac{1}{2}x+\dfrac{3}{5}x=\dfrac{-33}{25}\)
b, \(\left(\dfrac{2}{3}x-\dfrac{4}{9}\right)\left(\dfrac{1}{2}+\dfrac{-3}{7}:x\right)=0\)