Số nguyên x mà 1/7-1/3-1/4\(\Leftarrow\)x\(\Leftarrow\)1/5-1/6 là
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a)x=\(\dfrac{1}{4}+\dfrac{2}{13}\)
b)\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)
c)\(\dfrac{-8}{3}+\dfrac{-1}{3}\le x\le\dfrac{-2}{7}+\dfrac{-5}{7}\)
d)\(\dfrac{-5}{6}+\dfrac{8}{3}\dfrac{29}{-x}\le x\le\dfrac{-1}{2}+2+\dfrac{5}{2}\)
Bài 1 : Tìm x
a) 4dfrac{1}{2}x : dfrac{5}{12}0,5 b)1,5+1dfrac{1}{4}.x dfrac{2}{3} c) 7,5.1dfrac{3}{4}6dfrac{2}{5} d)(x - 5):dfrac{1}{3}dfrac{2}{5} e) (4,5-2x):dfrac{3}{4}1dfrac{1}{3} f) (2,7x - 1dfrac{1}{2}x) : dfrac{2}{7}dfrac{-21}{7}
Bài 2 : tìm a,b biết
dfrac{a}{27}dfrac{-5}{9}dfrac{-45}{b}
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Bài 1 : Tìm x
a) 4\(\dfrac{1}{2}\)x : \(\dfrac{5}{12}\)=0,5 b)1,5+1\(\dfrac{1}{4}\).x= \(\dfrac{2}{3}\) c) 7,5.1\(\dfrac{3}{4}\)=\(6\dfrac{2}{5}\) d)(x - 5):\(\dfrac{1}{3}\)=\(\dfrac{2}{5}\) e) (4,5-2x):\(\dfrac{3}{4}\)=1\(\dfrac{1}{3}\) f) (2,7x - 1\(\dfrac{1}{2}\)x) : \(\dfrac{2}{7}=\dfrac{-21}{7}\)
Bài 2 : tìm a,b biết
\(\dfrac{a}{27}=\dfrac{-5}{9}=\dfrac{-45}{b}\)
bài 1: tìm x bt:
a\(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)
b, \(5\dfrac{4}{7}:x=13\)
c, (2 và 4/5.x-50) :2/3= 51
d,\(\left(x+\dfrac{1}{2}\right).\left(\dfrac{2}{3}-2x\right)=0\)
e, \(\dfrac{2}{3}-\dfrac{1}{2}x=\dfrac{5}{12}\)
giúp mk nhs!!!!!!!!!!
tim x , biet :
b, |dfrac{5}{4}x-dfrac{7}{2}||dfrac{5}{8}x+dfrac{3}{5}|0
c, |dfrac{7}{5}x+dfrac{2}{3}||dfrac{4}{3}x-dfrac{1}{4}|
d, |dfrac{7}{8}x+dfrac{5}{6}|-|dfrac{1}{2}x+5|0
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tim x , biet :
b, |\(\dfrac{5}{4}\)x-\(\dfrac{7}{2}\)|=|\(\dfrac{5}{8}\)x+\(\dfrac{3}{5}\)|=0
c, |\(\dfrac{7}{5}\)x+\(\dfrac{2}{3}\)|=|\(\dfrac{4}{3}\)x-\(\dfrac{1}{4}\)|
d, |\(\dfrac{7}{8}\)x+\(\dfrac{5}{6}\)|-|\(\dfrac{1}{2}\)x+5|=0
1. Tim x:
a. dfrac{x}{5} dfrac{5}{6} + dfrac{-19}{30}
b. dfrac{-5}{6} -x dfrac{7}{12}- dfrac{1}{3}times x
c.2016^{^{ }3} times2016^{^{ }x} 2016^{^{ }8}
d. (x+dfrac{3}{4}):dfrac{5}{2}3^1_2
e. (2,8 x - 2^5) : dfrac{2}{3}3^2
f. dfrac{4}{7}times x-dfrac{2}{3}dfrac{2}{5}
g. (dfrac{3x}{7}+1):left(-4right)dfrac{-1}{28}
2. Thuc hien phep tinh:
a. dfrac{1}{2}+dfrac{1}{2}timesdfrac{2}{3}-dfrac{1}{3}:dfrac{3}{4}+1^4_5
b. dfrac{7times5^2-7^2}{7times24+21}
c. dfrac{2}{3}+dfrac{1}{3}times(-dfr...
Đọc tiếp
1. Tim x:
a. \(\dfrac{x}{5}\) = \(\dfrac{5}{6}\) + \(\dfrac{-19}{30}\)
b. \(\dfrac{-5}{6}\) \(-x\) = \(\dfrac{7}{12}\)\(-\) \(\dfrac{1}{3}\)\(\times\) \(x\)
c.2016\(^{^{ }3}\) \(\times\)2016\(^{^{ }x}\) = 2016\(^{^{ }8}\)
d. \((x+\dfrac{3}{4}):\dfrac{5}{2}=3^1_2\)
e. (2,8 \(x\) \(-\) 2\(^5\)) : \(\dfrac{2}{3}=3^2\)
f. \(\dfrac{4}{7}\times x-\dfrac{2}{3}=\dfrac{2}{5}\)
g. \((\dfrac{3x}{7}+1):\left(-4\right)=\dfrac{-1}{28}\)
2. Thuc hien phep tinh:
a. \(\dfrac{1}{2}+\dfrac{1}{2}\times\dfrac{2}{3}-\dfrac{1}{3}:\dfrac{3}{4}+1^4_5\)
b. \(\dfrac{7\times5^2-7^2}{7\times24+21}\)
c. \(\dfrac{2}{3}+\dfrac{1}{3}\times(-\dfrac{4}{9}+\dfrac{5}{6}):\dfrac{7}{12}\)
bài 1 : tính
a,dfrac{-6}{11}: (dfrac{3}{5}.dfrac{4}{11})
b, dfrac{7}{12} + dfrac{5}{12} : 6 - dfrac{11}{36}
c, ( dfrac{4}{5} +dfrac{1}{2} ) : ( dfrac{3}{13}-dfrac{8}{13})
d, ( dfrac{2}{3} -dfrac{1}{4} +dfrac{5}{11} ) : ( dfrac{8}{12} +1 - dfrac{7}{11} )
bài 2 , tìm x, biết
a, dfrac{-2}{5}. x +dfrac{4}{3} dfrac{7}{3}
b,dfrac{9}{8}+dfrac{3}{8}-x 0,125
c,dfrac{3}{4}: x dfrac{-7}{12}
d,dfrac{3}{8}-dfrac{1}{6}- x dfrac{1}{4}
e, dfrac{1}{3}+dfrac{1}{2}: x -4
Đọc tiếp
bài 1 : tính
a,\(\dfrac{-6}{11}\): (\(\dfrac{3}{5}.\)\(\dfrac{4}{11}\))
b, \(\dfrac{7}{12}\) + \(\dfrac{5}{12}\) : 6 - \(\dfrac{11}{36}\)
c, ( \(\dfrac{4}{5}\) +\(\dfrac{1}{2}\) ) : ( \(\dfrac{3}{13}\)-\(\dfrac{8}{13}\))
d, ( \(\dfrac{2}{3}\) -\(\dfrac{1}{4}\) +\(\dfrac{5}{11}\) ) : ( \(\dfrac{8}{12}\) +1 - \(\dfrac{7}{11}\) )
bài 2 , tìm x, biết
a, \(\dfrac{-2}{5}\). x +\(\dfrac{4}{3}\) = \(\dfrac{7}{3}\)
b,\(\dfrac{9}{8}\)+\(\dfrac{3}{8}\)-x = 0,125
c,\(\dfrac{3}{4}\): x =\(\dfrac{-7}{12}\)
d,\(\dfrac{3}{8}\)-\(\dfrac{1}{6}\)- x = \(\dfrac{1}{4}\)
e, \(\dfrac{1}{3}\)+\(\dfrac{1}{2}\): x = -4
1. Tính ( hợp lí nếu có thể )
a) dfrac{5}{11}+dfrac{23}{29}+dfrac{17}{11} d)dfrac{-21}{10}+dfrac{21}{10}timesdfrac{3}{4}-dfrac{3}{4}
b) dfrac{17}{5}left(5+dfrac{2}{7}right)+dfrac{47}{7}xdfrac{17}{5} e) 2-1,6:left(1+dfrac{2}{3}right)+4%
c)10dfrac{3}{7}-left(2dfrac{1}{8}+4dfrac{3}{7}right)
2. Tìm x, biết:
a)dfrac{2}{3}+x-45% d)3-/x-dfrac{1}{2}/dfrac{1}{2}(/../giá trị tuyệt đối...)
b)x+dfrac{2}{3}x-dfrac{4}{5}x2dfrac{1}{2} e)dfrac{15}{x}-dfrac{1}{3}dfrac{28}{51}
c)45:left(3x-4right)3^2
3.Mộ...
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1. Tính ( hợp lí nếu có thể )
a) \(\dfrac{5}{11}+\dfrac{23}{29}+\dfrac{17}{11}\) d)\(\dfrac{-21}{10}+\dfrac{21}{10}\times\dfrac{3}{4}-\dfrac{3}{4}\)
b) \(\dfrac{17}{5}\left(5+\dfrac{2}{7}\right)+\dfrac{47}{7}\)x\(\dfrac{17}{5}\) e) \(2-1,6:\left(1+\dfrac{2}{3}\right)+4\%\)
c)\(10\dfrac{3}{7}-\left(2\dfrac{1}{8}+4\dfrac{3}{7}\right)\)
2. Tìm x, biết:
a)\(\dfrac{2}{3}+x=-45\%\) d)\(3\)-/x-\(\dfrac{1}{2}\)/=\(\dfrac{1}{2}\)(/../giá trị tuyệt đối...)
b)\(x+\dfrac{2}{3}x-\dfrac{4}{5}x=2\dfrac{1}{2}\) e)\(\dfrac{15}{x}-\dfrac{1}{3}=\dfrac{28}{51}\)
c)\(45:\left(3x-4\right)=3^2\)
3.Một khu cườn hình chữ nhật có chiều dài 60 m. Chiều rộng bằng \(\dfrac{3}{4}\) chiều dài
a) Tính diện tích đám đất
b) Người ta để \(\dfrac{7}{9}\) diện tích đám đất trồng cây ăn quả. 30% diện tích còn lại đào ao thả cá. Tính diện tích đào ao thả cá
4. Trên nữa mặt phẳng bờ chứa tia Ox và hai tia Oy và Oz sao cho góc xOy=100o, xOz=20o.
a)Tính góc yOz
b)Vẽ Om là tia phân giác yOz. Tính xOm
Tìm các số tự nhiên x, y sao cho:
a) \(\dfrac{x}{3}-\dfrac{4}{y}=\dfrac{1}{5}\)
b) \(\dfrac{5}{x}-\dfrac{y}{3}=\dfrac{1}{6}\)
c) \(\dfrac{x}{6}-\dfrac{2}{y}=\dfrac{1}{3}\)
Bài 1. Tính giá trị biểu thức
125%.(dfrac{-1}{2})^2:(1dfrac{5}{16}-1,5)+2008^0
dfrac{2}{3.5}+dfrac{2}{5.3}+dfrac{2}{7.9}+dfrac{2}{9.11}+dfrac{2}{11.13}+dfrac{2}{13.15}
Bài 2. Tìm x, biết
x:3dfrac{1}{15}1dfrac{1}{12}
dfrac{3}{4}.x27
x.dfrac{1}{4}dfrac{5}{8}.dfrac{2}{3}
left(x+dfrac{1}{4}right):dfrac{3}{7}dfrac{1}{6}
dfrac{3}{4}-2.|2x-dfrac{2}{3}|2
dfrac{2}{3}x-dfrac{1}{2}xdfrac{5}{2}
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Bài 1. Tính giá trị biểu thức
125%.\((\dfrac{-1}{2})^2\):\((1\dfrac{5}{16}-1,5)+2008^0\)
\(\dfrac{2}{3.5}+\dfrac{2}{5.3}+\dfrac{2}{7.9}+\dfrac{2}{9.11}+\dfrac{2}{11.13}+\dfrac{2}{13.15}\)
Bài 2. Tìm x, biết
x:\(3\dfrac{1}{15}=1\dfrac{1}{12}\)
\(\dfrac{3}{4}.x=27\)
\(x.\dfrac{1}{4}=\dfrac{5}{8}.\dfrac{2}{3}\)
\(\left(x+\dfrac{1}{4}\right):\dfrac{3}{7}=\dfrac{1}{6}\)
\(\dfrac{3}{4}-2.|2x-\dfrac{2}{3}|=2\)
\(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{2}\)