p:là phần nka giải: =[(-5p12-7p12)].(2p7+3p14) =(-1).1p2 =(-1p2)
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Đại số lớp 6
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1, Tính
-2dfrac{1}{4}.left(3dfrac{5}{12}-1dfrac{2}{9}right)
left(-25%+0,75+dfrac{7}{12}right):left(-2dfrac{1}{8}right)
2, Tính nhanh
dfrac{4}{9}.19dfrac{1}{3}-dfrac{4}{9}.39dfrac{1}{3} | 19dfrac{5}{8}:dfrac{7}{12}-15dfrac{1}{4}.dfrac{12}{7}
dfrac{-5}{7}.dfrac{5}{11}+dfrac{-5}{7}.dfrac{2}{11}-dfrac{5}{7}:dfrac{11}{14} | dfrac{4}{7}.dfrac{89}{5}-dfrac{4}{5}.dfrac{82}{7}
dfrac{5}{7}.dfrac{-4}{19}+dfrac{-15}{7}.dfrac{5}{19}...
Đọc tiếp
1, Tính
\(-2\dfrac{1}{4}.\left(3\dfrac{5}{12}-1\dfrac{2}{9}\right)\)
\(\left(-25\%+0,75+\dfrac{7}{12}\right):\left(-2\dfrac{1}{8}\right)\)
2, Tính nhanh
\(\dfrac{4}{9}.19\dfrac{1}{3}-\dfrac{4}{9}.39\dfrac{1}{3}\) | \(19\dfrac{5}{8}:\dfrac{7}{12}-15\dfrac{1}{4}.\dfrac{12}{7}\)
\(\dfrac{-5}{7}.\dfrac{5}{11}+\dfrac{-5}{7}.\dfrac{2}{11}-\dfrac{5}{7}:\dfrac{11}{14}\) | \(\dfrac{4}{7}.\dfrac{89}{5}-\dfrac{4}{5}.\dfrac{82}{7}\)
\(\dfrac{5}{7}.\dfrac{-4}{19}+\dfrac{-15}{7}.\dfrac{5}{19}\) | \(8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)
- Giải hộ với ạ, mấy anh, chị lớp 7,8 cũng được huhu :(( sáng mai nộp đề cương rồi. Làm ơn đi a
Muốn gì cũng hậu tạ :>
Thực hiện phép tính( hợp lí nếu có thể)
dfrac{1}{2}+dfrac{3}{4}-left(dfrac{3}{4}-dfrac{4}{5}right)
dfrac{-3}{7}+dfrac{3}{4}:dfrac{3}{14}
5-dfrac{7}{39}:dfrac{7}{13}+dfrac{8}{9}:4
1dfrac{13}{15}.0,75-left(dfrac{11}{20}+25%right):dfrac{7}{3}
left(dfrac{5}{12}:dfrac{11}{6}+dfrac{5}{12}:dfrac{11}{5}right)--dfrac{7}{12}
làm nhanh cho mình nha!!!!Thank nhìu
Đọc tiếp
Thực hiện phép tính( hợp lí nếu có thể)
\(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
\(\dfrac{-3}{7}+\dfrac{3}{4}:\dfrac{3}{14}\)
\(5-\dfrac{7}{39}:\dfrac{7}{13}+\dfrac{8}{9}:4\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{3}\)
\(\left(\dfrac{5}{12}:\dfrac{11}{6}+\dfrac{5}{12}:\dfrac{11}{5}\right)--\dfrac{7}{12}\)
làm nhanh cho mình nha!!!!Thank nhìu
Tính nhanh:
11) \(\dfrac{5}{7}\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{4}{7}\right)+\left(\dfrac{1}{3}-\dfrac{1}{2}-\dfrac{4}{7}\right):\dfrac{7}{5}\)
12)\(\dfrac{43}{5}\left(\dfrac{17}{3}-\dfrac{16}{9}+2\right)-\dfrac{43}{5}\left(\dfrac{17}{3}-\dfrac{16}{9}\right)\)
BT2: Tính nhanh
1) \(\dfrac{5}{6}-\dfrac{6}{7}+\dfrac{7}{8}-\dfrac{8}{9}+\dfrac{10}{9}-\dfrac{5}{6}+\dfrac{6}{7}-\dfrac{7}{8}+\dfrac{8}{9}\)
2) \(\dfrac{1}{13}+\dfrac{16}{7}+\dfrac{3}{105}-\dfrac{9}{7}-\dfrac{-12}{13}\)
BT1: Tính nhanh:
6) 81. \(\dfrac{12-\dfrac{12}{7}-\dfrac{12}{289}-\dfrac{12}{85}}{4-\dfrac{4}{7}-\dfrac{4}{289}-\dfrac{4}{85}}\) : \(\dfrac{5+\dfrac{5}{13}+\dfrac{5}{169}+\dfrac{5}{91}}{6+\dfrac{6}{13}+\dfrac{6}{169}+\dfrac{6}{91}}\). \(\dfrac{158158158}{711711711}\)
\(\dfrac{-3}{4}x\dfrac{4}{7}+\dfrac{-3}{5}x\dfrac{3}{7}-\dfrac{2}{5}\)
\(\left(\dfrac{3}{4}x\dfrac{5}{6}-\dfrac{7}{12}\right)x\left(\dfrac{-12}{7}\right)\)
\(1,4x\dfrac{15}{19}x\left(\dfrac{4}{5}x\dfrac{-2}{3}\right)+\dfrac{7}{15}\)
Tính nha
Bài 1: Thực hiện phép tính (hợp lý nếu có thể)
(6dfrac{4}{9}+3dfrac{7}{11})-4dfrac{4}{9}
1dfrac{1}{3}-2dfrac{5}{6}-dfrac{6}{11}+3:5%
4dfrac{3}{4}-0,37+dfrac{1}{8}-1,28-2,5+3dfrac{1}{12}
dfrac{5}{7}.dfrac{5}{11}+dfrac{5}{7}.dfrac{2}{11}-dfrac{5}{7}.dfrac{14}{11}
dfrac{left(2^3.5.7right).left(5^2.7^3right)}{left(2.5.7^2right)^2}
Đọc tiếp
Bài 1: Thực hiện phép tính (hợp lý nếu có thể)
\((6\dfrac{4}{9}+3\dfrac{7}{11})-4\dfrac{4}{9}\)
\(1\dfrac{1}{3}-2\dfrac{5}{6}-\dfrac{6}{11}+3:5\%\)
\(4\dfrac{3}{4}-0,37+\dfrac{1}{8}-1,28-2,5+3\dfrac{1}{12}\)
\(\dfrac{5}{7}.\dfrac{5}{11}+\dfrac{5}{7}.\dfrac{2}{11}-\dfrac{5}{7}.\dfrac{14}{11}\)
\(\dfrac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
Tính nhanh
a)(5dfrac{1}{7}- 3dfrac{3}{11}) - 2dfrac{1}{7}-1dfrac{8}{11}
b) (dfrac{1999}{2011}-dfrac{2011}{1999}) -(dfrac{-12}{1999}-dfrac{12}{2011})
c)(1-dfrac{1}{2})(1-dfrac{1}{3})............(1-dfrac{1}{2017})
d) dfrac{2}{15}.6dfrac{5}{11}+dfrac{5}{11}.dfrac{-2}{15}-dfrac{2}{15}.2015^0
e)dfrac{1}{6}-dfrac{1}{39}+dfrac{1}{51}:dfrac{1}{8}-dfrac{1}{12}+dfrac{1}{68}
Đọc tiếp
Tính nhanh
a)(5\(\dfrac{1}{7}\)- 3\(\dfrac{3}{11}\)) - 2\(\dfrac{1}{7}\)-1\(\dfrac{8}{11}\)
b) (\(\dfrac{1999}{2011}-\dfrac{2011}{1999}\)) -(\(\dfrac{-12}{1999}-\dfrac{12}{2011}\))
c)(1-\(\dfrac{1}{2}\))(1-\(\dfrac{1}{3}\))............(1-\(\dfrac{1}{2017}\))
d) \(\dfrac{2}{15}.6\dfrac{5}{11}+\dfrac{5}{11}.\dfrac{-2}{15}\)\(-\dfrac{2}{15}.2015^0\)
e)\(\dfrac{1}{6}-\dfrac{1}{39}+\dfrac{1}{51}\):\(\dfrac{1}{8}-\dfrac{1}{12}+\dfrac{1}{68}\)
1.Tính nhanh
Adfrac{2}{7}+dfrac{-3}{8}+dfrac{11}{7}+dfrac{1}{3}+dfrac{1}{7}+dfrac{5}{-3}
Bdfrac{3}{17}+dfrac{-5}{13}+dfrac{-18}{35}+dfrac{14}{17}+dfrac{17}{-35}+dfrac{-8}{13}
Cdfrac{-3}{17}+(dfrac{2}{3}+dfrac{3}{17})
D(dfrac{-1}{6}+dfrac{5}{-12})+dfrac{7}{12}
2.a) Chứng tỏ:dfrac{1}{201}+dfrac{1}{212}+. . .+dfrac{1}{399}+dfrac{1}{400}
b)1 dfrac{1}{5}+dfrac{1}{6}+. . .+dfrac{1}{16}+dfrac{1}{17} 2
Đọc tiếp
1.Tính nhanh
A=\(\dfrac{2}{7}\)+\(\dfrac{-3}{8}\)+\(\dfrac{11}{7}\)+\(\dfrac{1}{3}\)+\(\dfrac{1}{7}\)+\(\dfrac{5}{-3}\)
B=\(\dfrac{3}{17}\)+\(\dfrac{-5}{13}\)+\(\dfrac{-18}{35}\)+\(\dfrac{14}{17}\)+\(\dfrac{17}{-35}\)+\(\dfrac{-8}{13}\)
C=\(\dfrac{-3}{17}\)+(\(\dfrac{2}{3}\)+\(\dfrac{3}{17}\))
D=(\(\dfrac{-1}{6}\)+\(\dfrac{5}{-12}\))+\(\dfrac{7}{12}\)
2.a) Chứng tỏ:\(\dfrac{1}{201}\)+\(\dfrac{1}{212}\)+. . .+\(\dfrac{1}{399}\)+\(\dfrac{1}{400}\)
b)1 < \(\dfrac{1}{5}\)+\(\dfrac{1}{6}\)+. . .+\(\dfrac{1}{16}\)+\(\dfrac{1}{17}\)< 2