Ôn tập toán 6
Các câu hỏi tương tự
Bài 1: Thực hiện phép tính
a) left(dfrac{3}{8}+dfrac{-3}{4}+dfrac{7}{12}right):dfrac{5}{6}+dfrac{1}{2}
b) dfrac{1}{2}+dfrac{3}{4}-left(dfrac{3}{4}-dfrac{4}{5}right)
c) 6dfrac{5}{12}:2dfrac{3}{4}+11dfrac{1}{4}.left(dfrac{1}{3}dfrac{1}{5}right)
d)left(dfrac{7}{8}-dfrac{3}{4}right).1dfrac{1}{3}-dfrac{2}{7}.left(3,5right)^2
e)left(dfrac{3}{5}+0,415-dfrac{3}{200}right).2dfrac{2}{3}.0,25
f)dfrac{5}{16}:0,125-left(2dfrac{1}{4}-0,6right).dfrac{10}{11}
g) 0,25:left(10,3-9,8right)-dfrac{3}{4}
h)1dfrac{13...
Đọc tiếp
Bài 1: Thực hiện phép tính
a) \(\left(\dfrac{3}{8}+\dfrac{-3}{4}+\dfrac{7}{12}\right):\dfrac{5}{6}+\dfrac{1}{2}\)
b) \(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
c) \(6\dfrac{5}{12}:2\dfrac{3}{4}+11\dfrac{1}{4}.\left(\dfrac{1}{3}\dfrac{1}{5}\right)\)
d)\(\left(\dfrac{7}{8}-\dfrac{3}{4}\right).1\dfrac{1}{3}-\dfrac{2}{7}.\left(3,5\right)^2\)
e)\(\left(\dfrac{3}{5}+0,415-\dfrac{3}{200}\right).2\dfrac{2}{3}.0,25\)
f)\(\dfrac{5}{16}:0,125-\left(2\dfrac{1}{4}-0,6\right).\dfrac{10}{11}\)
g) \(0,25:\left(10,3-9,8\right)-\dfrac{3}{4}\)
h)\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+20\%\right):\dfrac{7}{3}\)
i)\(\dfrac{\left(\dfrac{1}{2-0,75}\right).\left(0,2-\dfrac{2}{5}\right)}{\dfrac{5}{9}-1\dfrac{1}{12}}\)
k)\(\dfrac{\dfrac{2}{3}+\dfrac{2}{7}-\dfrac{1}{14}}{-1-\dfrac{3}{7}+\dfrac{3}{28}}\)
Bài 2: Tính bằng cánh hợp lí
A=\(0,7.2\dfrac{2}{3}.20.0,375.\dfrac{5}{28}\)
B=\(\left(9\dfrac{30303}{80808}+7\dfrac{303030}{484848}\right)+4,03\)
C=\(\left(9,75.21\dfrac{3}{7}+\dfrac{39}{4}.18\dfrac{4}{7}\right).\dfrac{15}{78}\)
D=\(10101.\left(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37}\right)\)
TÍNH
\(10101.(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37})\)
Tính hợp lí giá trị các biểu thức sau
I = \(10101.\left(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37}\right)\)
giúp miình ới
Cho C= \(4+\dfrac{1}{7^6}+\dfrac{3}{7}+\dfrac{4}{7^2}+\dfrac{-441}{7^6}+\dfrac{27}{7^5}\)
D= \(\dfrac{147}{7^3}+4+\dfrac{35}{7^7}+\dfrac{4}{7^2}+\dfrac{27}{7^5}+\dfrac{-9}{7^9}\)
So sánh C với D
bài 1 : so sánh :
a) dfrac{23}{21}vàdfrac{21}{23}
b)dfrac{19}{26}và dfrac{21}{25}
bài 2 : sắp sếp các phân số sau từ bé đến lớn :
a)dfrac{7}{36};dfrac{24}{36};dfrac{13}{36};dfrac{1}{36};dfrac{43}{36};dfrac{36}{36}
b)dfrac{-3}{10};dfrac{-31}{100};dfrac{-297}{1000};dfrac{10000}{-3056}
c)dfrac{13}{20};dfrac{7}{20};dfrac{9}{4};dfrac{2}{5};dfrac{1}{2}
d)dfrac{13}{21};dfrac{152}{17};dfrac{13}{17};dfrac{-5}{21}
e)dfrac{-1}{2};dfrac{3}{-4};dfrac{-2}{3};dfrac{4}{-5}
Đọc tiếp
bài 1 : so sánh :
a) \(\dfrac{23}{21}\)và\(\dfrac{21}{23}\)
b)\(\dfrac{19}{26}\)và \(\dfrac{21}{25}\)
bài 2 : sắp sếp các phân số sau từ bé đến lớn :
a)\(\dfrac{7}{36};\dfrac{24}{36};\dfrac{13}{36};\dfrac{1}{36};\dfrac{43}{36};\dfrac{36}{36}\)
b)\(\dfrac{-3}{10};\dfrac{-31}{100};\dfrac{-297}{1000};\dfrac{10000}{-3056}\)
c)\(\dfrac{13}{20};\dfrac{7}{20};\dfrac{9}{4};\dfrac{2}{5};\dfrac{1}{2}\)
d)\(\dfrac{13}{21};\dfrac{152}{17};\dfrac{13}{17};\dfrac{-5}{21}\)
e)\(\dfrac{-1}{2};\dfrac{3}{-4};\dfrac{-2}{3};\dfrac{4}{-5}\)
Bài 1 : Tính bằng cách hợp lí :
a ) A ( dfrac{dfrac{1}{13}-dfrac{1}{17}-dfrac{1}{23}}{dfrac{2}{13}-dfrac{2}{17}-dfrac{2}{23}} ) . ( dfrac{dfrac{1}{3}-0,25+0,2}{1dfrac{1}{6}-0,875+0,7} ) + dfrac{6}{7}
b ) B 2000 : [ ( dfrac{0,4-dfrac{2}{9}+dfrac{2}{11}}{1,4-dfrac{7}{9}+dfrac{7}{11}} ) . ( dfrac{-1dfrac{1}{6}+0,875-0,7}{dfrac{1}{3}-0,25+dfrac{1}{5}} ) ]
c ) C 10101 . ( dfrac{5}{111111}+dfrac{2}{222222}-dfrac{4}{21.143.37} )
Bài 2 : Tìm x :
a ) dfrac{1}{2.5}+dfrac{1}{5.8}+dfrac{1}{8.11}+.....
Đọc tiếp
Bài 1 : Tính bằng cách hợp lí :
a ) A = \((\) \(\dfrac{\dfrac{1}{13}-\dfrac{1}{17}-\dfrac{1}{23}}{\dfrac{2}{13}-\dfrac{2}{17}-\dfrac{2}{23}}\) \()\) . \((\) \(\dfrac{\dfrac{1}{3}-0,25+0,2}{1\dfrac{1}{6}-0,875+0,7}\) \()\) + \(\dfrac{6}{7}\)
b ) B = 2000 : \([\) \((\) \(\dfrac{0,4-\dfrac{2}{9}+\dfrac{2}{11}}{1,4-\dfrac{7}{9}+\dfrac{7}{11}}\) \()\) . \((\) \(\dfrac{-1\dfrac{1}{6}+0,875-0,7}{\dfrac{1}{3}-0,25+\dfrac{1}{5}}\) \()\) \(]\)
c ) C = 10101 . \((\) \(\dfrac{5}{111111}+\dfrac{2}{222222}-\dfrac{4}{21.143.37}\) \()\)
Bài 2 : Tìm x :
a ) \(\dfrac{1}{2.5}+\dfrac{1}{5.8}+\dfrac{1}{8.11}+......+\dfrac{1}{125.155}-x=\dfrac{1}{310}\)
b ) \(1\dfrac{3}{5}+(\dfrac{\dfrac{2}{7}\dfrac{2}{17}\dfrac{2}{37}}{\dfrac{5}{7}\dfrac{5}{17}\dfrac{5}{37}}).\) x = \(\dfrac{16}{5}\)
câu 1: thực hiện phép tính: a)\(\dfrac{8}{5}-\dfrac{9}{5}\) ; b)\(\dfrac{5}{2}+\dfrac{2}{3}\) ; c)\(\dfrac{-5}{9}.\dfrac{2}{11}\); d)\(\dfrac{-2}{9}:\dfrac{1}{3}\); e)\(\dfrac{3}{8}+\dfrac{-1}{4}+\dfrac{5}{12}\); f)\(\dfrac{-4}{3}.\dfrac{5}{4}:\dfrac{7}{3}\)
Chứng minh rằng:
1) B dfrac{1}{4}+dfrac{1}{5}+dfrac{1}{6}+...+dfrac{1}{19}1
2) Adfrac{1}{5}+dfrac{2}{5^2}+dfrac{3}{5^3}+dfrac{4}{5^4}+...+dfrac{500}{5^{500}}100
3) Cdfrac{1}{2^3}+dfrac{1}{3^3}+dfrac{1}{4^3}+dfrac{1}{5^3}+...+dfrac{1}{500^3}dfrac{1}{4}
4) Ddfrac{4}{3}+dfrac{10}{9}+dfrac{28}{27}+...+dfrac{3^{98}+1}{3^{98}}100
Làm giúp mình sớm nha! Thanks.
Đọc tiếp
Chứng minh rằng:
1) B =\(\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{6}+...+\dfrac{1}{19}>1\)
2) \(A=\dfrac{1}{5}+\dfrac{2}{5^2}+\dfrac{3}{5^3}+\dfrac{4}{5^4}+...+\dfrac{500}{5^{500}}<100\)
3) \(C=\dfrac{1}{2^3}+\dfrac{1}{3^3}+\dfrac{1}{4^3}+\dfrac{1}{5^3}+...+\dfrac{1}{500^3}<\dfrac{1}{4}\)
4) \(D=\dfrac{4}{3}+\dfrac{10}{9}+\dfrac{28}{27}+...+\dfrac{3^{98}+1}{3^{98}}<100\)
Làm giúp mình sớm nha! Thanks.
tính nhanh :
a) 6dfrac{5}{7}-left(1dfrac{3}{4}+2dfrac{5}{7}right)
b) 7dfrac{5}{11}-left(2dfrac{3}{7}+3dfrac{5}{11}right)
c) dfrac{1}{3}.dfrac{4}{5}+dfrac{1}{3}.dfrac{6}{5}-dfrac{4}{3}
d) left(dfrac{-4}{5}+dfrac{4}{3}right)+left(dfrac{-5}{4}+dfrac{14}{5}right)-dfrac{7}{3}
e) dfrac{-5}{7}.dfrac{2}{11}+dfrac{-5}{7}.dfrac{9}{14}+1dfrac{5}{7}
Đọc tiếp
tính nhanh :
a) \(6\dfrac{5}{7}-\left(1\dfrac{3}{4}+2\dfrac{5}{7}\right)\)
b) \(7\dfrac{5}{11}-\left(2\dfrac{3}{7}+3\dfrac{5}{11}\right)\)
c) \(\dfrac{1}{3}.\dfrac{4}{5}+\dfrac{1}{3}.\dfrac{6}{5}-\dfrac{4}{3}\)
d) \(\left(\dfrac{-4}{5}+\dfrac{4}{3}\right)+\left(\dfrac{-5}{4}+\dfrac{14}{5}\right)-\dfrac{7}{3}\)
e) \(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{14}+1\dfrac{5}{7}\)