Violympic toán 6
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23 tháng 2 2021 lúc 9:15
Tìm x :
a) \(\left|x+\dfrac{11}{17}\right|+\left|x+\dfrac{2}{17}\right|+\left|x+\dfrac{4}{17}\right|=4x\)
b) \(\left|x+\dfrac{1}{2}\right|+\left|x+\dfrac{1}{6}\right|+\left|x+\dfrac{1}{12}\right|+\left|x+\dfrac{1}{20}\right|+..+\left|x+\dfrac{1}{110}\right|=11x\)
Tìm các số nguyên x,y,z,t biết
\(\dfrac{12}{-6}=\dfrac{x}{5}=\dfrac{-y}{3}=\dfrac{z}{-17}=\dfrac{-t}{9}\)
Tính thuận tiện A=\(\dfrac{3}{2}-\dfrac{5}{6}+\dfrac{7}{12}-\dfrac{9}{20}+\dfrac{11}{30}-\dfrac{13}{42}+\dfrac{15}{56}-\dfrac{17}{72}\)
Tính giá trị của biểu thức
A=\(\dfrac{\dfrac{5}{12}+\dfrac{3}{4}-1}{3-\dfrac{5}{6}+\dfrac{2}{3}}\)+\(\dfrac{\dfrac{16}{5}+\dfrac{16}{7}-\dfrac{16}{9}}{\dfrac{17}{5}+\dfrac{17}{7}-\dfrac{17}{9}}\)
1. Tìm x, biết:
a, 1dfrac{3}{5} + dfrac{dfrac{2}{7}+dfrac{2}{17}+dfrac{2}{37}}{dfrac{5}{7}+dfrac{5}{17}+dfrac{5}{37}} . x dfrac{16}{5}
b, (dfrac{1}{24.25} + dfrac{1}{25.26} + . . . + dfrac{1}{39.40} ) . 120 + x. dfrac{1}{3} -4
c, left|x-dfrac{1}{3}right| . 2 + dfrac{4}{5} 0,24
d, dfrac{24}{7x-3} dfrac{-4}{25}
e, ( 50% x + 5dfrac{1}{4} ) , dfrac{-2}{3} 2dfrac{5}{6}
f, 1dfrac{1}{3} - 25%dfrac{-5}{12} + 2x 1,6 : dfrac{3}{5}
Đọc tiếp
1. Tìm x, biết:
a, \(1\dfrac{3}{5}\) + \(\dfrac{\dfrac{2}{7}+\dfrac{2}{17}+\dfrac{2}{37}}{\dfrac{5}{7}+\dfrac{5}{17}+\dfrac{5}{37}}\) . x = \(\dfrac{16}{5}\)
b, (\(\dfrac{1}{24.25}\) + \(\dfrac{1}{25.26}\) + . . . + \(\dfrac{1}{39.40}\) ) . 120 + x. \(\dfrac{1}{3}\) = -4
c, \(\left|x-\dfrac{1}{3}\right|\) . 2 + \(\dfrac{4}{5}\) = 0,24
d, \(\dfrac{24}{7x-3}\) = \(\dfrac{-4}{25}\)
e, ( 50% x + \(5\dfrac{1}{4}\) ) , \(\dfrac{-2}{3}\) = \(2\dfrac{5}{6}\)
f, \(1\dfrac{1}{3}\) - 25%\(\dfrac{-5}{12}\) + 2x = 1,6 : \(\dfrac{3}{5}\)
2. tìm x
a. dfrac{x}{8}dfrac{-9}{6}
b. dfrac{4}{9}+dfrac{7}{3}:xdfrac{1}{5}
c. dfrac{-5}{9}- xdfrac{4}{3}
d. x +dfrac{4}{17}dfrac{2}{34}
e. dfrac{3}{4}.xdfrac{7}{8}
f. 5dfrac{4}{7}: x11
Đọc tiếp
2. tìm x
a. \(\dfrac{x}{8}\)=\(\dfrac{-9}{6}\)
b. \(\dfrac{4}{9}\)+\(\dfrac{7}{3}\):x=\(\dfrac{1}{5}\)
c. \(\dfrac{-5}{9}\)- x=\(\dfrac{4}{3}\)
d. x +\(\dfrac{4}{17}\)=\(\dfrac{2}{34}\)
e. \(\dfrac{3}{4}\).x=\(\dfrac{7}{8}\)
f. \(5\dfrac{4}{7}\): x=11
a) \(\dfrac{\left(3+\dfrac{1}{6}\right)-\dfrac{2}{5}}{\left(5-\dfrac{1}{6}\right)+\dfrac{7}{10}}\)
b) \(\dfrac{\left(4,08-\dfrac{2}{25}\right):\dfrac{4}{17}}{\left(6\dfrac{5}{9}-3\dfrac{1}{4}\right).2\dfrac{2}{7}}\)
c) \(\dfrac{2-\dfrac{1}{4}+\dfrac{1}{3}-\dfrac{3}{5}}{3-\dfrac{1}{5}-\dfrac{5}{3}}\)
Bài 1: Tính:
a) 10,(3) + 0,(4) - 8,(6)
b) \(\dfrac{0,8:\left(\dfrac{4}{5}.1,25\right)}{0,64-\dfrac{1}{25}}+\dfrac{\left(1,08-\dfrac{2}{25}\right):\dfrac{4}{7}}{\left(6\dfrac{5}{9}-3\dfrac{1}{4}\right).2\dfrac{2}{17}}+\left(1,2.0,5\right):\dfrac{4}{5}\)
Bài 1: quy đồng mẫu các p/s sau:
a) dfrac{7}{30};dfrac{8}{45};dfrac{11}{90}
b)dfrac{-4}{5};dfrac{1}{6};dfrac{-9}{7}
c)dfrac{-7}{24};dfrac{11}{12};dfrac{-23}{36}
d) dfrac{17}{30};dfrac{-22}{75};5
Đọc tiếp
Bài 1: quy đồng mẫu các p/s sau:
a) \(\dfrac{7}{30}\);\(\dfrac{8}{45}\);\(\dfrac{11}{90}\)
b)\(\dfrac{-4}{5}\);\(\dfrac{1}{6}\);\(\dfrac{-9}{7}\)
c)\(\dfrac{-7}{24}\);\(\dfrac{11}{12}\);\(\dfrac{-23}{36}\)
d) \(\dfrac{17}{30}\);\(\dfrac{-22}{75}\);5