\(\dfrac{3}{7}+\dfrac{4}{7}:\dfrac{4}{14}+2,5-75\%\)
\(=\dfrac{3}{7}+\dfrac{4}{7}:\dfrac{4}{14}+\dfrac{5}{2}-\dfrac{3}{4}\)
\(=\dfrac{3}{7}+2+\dfrac{5}{2}-\dfrac{3}{4}\)
\(=\dfrac{17}{7}+\dfrac{5}{2}-\dfrac{3}{4}\)
\(=\dfrac{69}{14}-\dfrac{3}{4}\)
\(=\dfrac{117}{28}\)
Bài 1: Thực hiện phép tính (hợp lý nếu có thể)
\((6\dfrac{4}{9}+3\dfrac{7}{11})-4\dfrac{4}{9}\)
\(1\dfrac{1}{3}-2\dfrac{5}{6}-\dfrac{6}{11}+3:5\%\)
\(4\dfrac{3}{4}-0,37+\dfrac{1}{8}-1,28-2,5+3\dfrac{1}{12}\)
\(\dfrac{5}{7}.\dfrac{5}{11}+\dfrac{5}{7}.\dfrac{2}{11}-\dfrac{5}{7}.\dfrac{14}{11}\)
\(\dfrac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
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
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 :>
BT1: Tính nhanh
1) \(\left(\dfrac{-4}{9}+\dfrac{3}{7}\right):1\dfrac{1}{15}+\left(\dfrac{4}{7}-\dfrac{5}{9}\right):1\dfrac{1}{15}\)
2) \(3\dfrac{2}{9}.15\dfrac{4}{7}-3\dfrac{2}{9}.8\dfrac{1}{7}+3\dfrac{2}{9}.\dfrac{15}{7}-3\dfrac{2}{9}.\dfrac{1}{7}\)
BT2: Tính nhanh
5) \(\dfrac{1}{7}.\dfrac{2}{5}+\dfrac{1}{7}.\dfrac{1}{5}+\dfrac{1}{7}.\dfrac{4}{5}\)
6) \(\dfrac{-3}{7}.\dfrac{19}{11}+\dfrac{-2}{7}.\dfrac{3}{11}+4\dfrac{6}{11}\)
1.Tính giá trị biểu thức : \(\dfrac{5.2010-1996}{14+4.2010}\).\(\dfrac{15+\dfrac{15}{7}-\dfrac{15}{11}+\dfrac{15}{2009}-\dfrac{15}{13}}{\dfrac{4}{2009}-\dfrac{4}{13}+\dfrac{4}{7}-\dfrac{4}{11}+4}\)
2. Tìm tất cả SNT p sao cho p + 2 và p + 28 là SNT
3. Cho A = 1 - 3 + 32 - 33 + ... - 32009 + 32010 . Chứng minh 4A - 1 là một luỹ thừa của 3.
Phép tính lằng nhằng ***** nhỉ ?????
Help Me vs ! Bn nào nhanh nhất , đúng nhất mik tặng tik !*(Lời giải chi tiết )* nội trong đêm nay nhé !
bài 1: TÍNH HỢP LÝ
a, \(49\dfrac{8}{23}-\left(5\dfrac{7}{32}+14\dfrac{8}{23}\right)\)
b, \(-\dfrac{3}{7}.\dfrac{5}{9}+\dfrac{4}{9}.\dfrac{-3}{7}+2\dfrac{3}{7}\)
c, \(0,7.2\dfrac{2}{3}.20.0.375.\dfrac{5}{28}\)
d, \(\left(9\dfrac{30303}{80808}+7\dfrac{303030}{484848}\right)+4.03\)
Bài 1: Tính nhanh
\(A=\dfrac{1}{4}.\dfrac{7}{3}.12\)
\(B=\dfrac{3}{8}.56.\dfrac{25}{7}.\left(-4\right)\)
\(C=\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{3}{13}.\dfrac{6}{7}\)
\(D=\dfrac{-1}{4}.\dfrac{152}{11}+\dfrac{68}{4}.\dfrac{-1}{11}\)
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)\(\dfrac{43}{5}\left(\dfrac{17}{3}-\dfrac{16}{9}+2\right)-\dfrac{43}{5}\left(\dfrac{17}{3}-\dfrac{16}{9}\right)\)
Khó quá các bn à!!!!
