\(\frac{7}{14}+\frac{2}{34}+\frac{-15}{5}+\frac{-6}{51}\) = \(\frac{1}{2}+\frac{1}{17}+\left(-3\right)+\frac{-2}{17}\)
= \(\left[\frac{1}{2}+\left(-3\right)\right]+\left(\frac{1}{17}+\frac{-2}{17}\right)\) = \(\frac{-5}{2}+\frac{-1}{17}=\frac{-87}{34}\)
Bài 1: Thực hiện phép tính:
a, \(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
b, \(\frac{-3}{7}.\frac{5}{9}+\frac{4}{9}.\frac{-3}{7}+2\frac{3}{7}\)
Bài 2: Tìm x
a, \(\frac{2}{3}.x-\frac{1}{2}.x=\frac{5}{12}\)
b, \(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
Bài 1: Thực hiện phép tính
a, \(\frac{4}{9}.\frac{2}{6}\)
b, \(1\frac{1}{3}.\left(0,5\right)+\left(\frac{8}{15}-\frac{19}{30}\right):\frac{6}{15}\)
Bài 2: Tìm x, biết
a, \(\left(\frac{2}{7}.x+\frac{3}{7}\right):2\frac{1}{5}-\frac{3}{7}=1\)
HELP ME!!!!!!!!!!!!!
bài 1:
a)\(\frac{11x-1}{4}=\frac{5}{2}\)
b)\(\left(3x-6\right).\left(\frac{x}{9}-\frac{1}{3}\right)=0\)
c)\(M=c.\frac{5}{7}+c.\frac{7}{14}-c.\frac{17}{14}vớic=\frac{2018}{2019}-\frac{2019}{2020}\)
d)\(N=\frac{-7}{13}+\left(2-\frac{19}{13}\right)+\frac{2020}{2018}:\frac{202}{2018}\)
CÁC BẠN GIẢI GIÚP MÌNH NHA☺
Bài 12.Tính
a\(-\frac{4}{12}+\frac{6}{7}+\frac{8}{24}\)
b\(\frac{9}{18}+-\frac{7}{12}+\frac{13}{32}\)
c\(\frac{5}{-8}+\frac{14}{25}-\frac{6}{10}\)
d\(\frac{11}{26}+\frac{32}{39}--\frac{14}{52}\)
(câu a là âm\(\frac{4}{12}\); b là âm \(\frac{7}{12}\) ; d là âm\(\frac{14}{52}\))
Bài 1: Tính nhanh
a, \(\frac{-3}{7}-\left(\frac{2}{3}-\frac{3}{7}\right)\)
b, \(\frac{2}{15}:\left(\frac{1}{3}.\frac{4}{5}-\frac{1}{3}.\frac{6}{5}\right)\)
Bài 2: Tìm x:
a, \(\frac{3}{4}+\frac{1}{4}.x=\frac{5}{8}\)
b, 25% . x+x= -1,25
Bài 1: Thực hiện phép tính bằng cách hợp lí < nếu có thể >
a, \(\left(-1,5\right).\left(1+\frac{2}{3}\right)+1,4.\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right):2\frac{1}{5}\)
b, \(\frac{7}{5}+\frac{4}{5}\left(\frac{5}{8}-\frac{7}{4}\right)+2014^0\)
c, \(1\frac{3}{25}+\frac{17}{19}-\frac{3}{25}+0,9+\frac{2}{19}\)
d, \(-\frac{5}{9}.\frac{6}{13}+\frac{-5}{9}.\frac{7}{23}+\frac{5}{23}:\frac{9}{7}\)
Bài 2: Tìm x, biết
a, 20%x + 0,4x = 4,5
b, \(\left(3\frac{1}{2}-2\left|x-1\right|\right).2\frac{2}{3}=5\frac{1}{3}\)
HELP MEEEEE
Bài 1: Thực hiện phép tính bằng cách hợp lí ( nếu có thể )
a, \(\left(-1,5\right).\left(1+\frac{2}{3}\right)+1,4.\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right):2\frac{1}{5}\)
b, \(\frac{7}{5}+\frac{4}{5}\left(\frac{5}{8}-\frac{7}{4}\right)+2014^0\)
c, \(1\frac{3}{25}+\frac{17}{19}-\frac{3}{25}+0,9+\frac{2}{19}\)
d, \(-\frac{5}{9}.\frac{6}{13}+\frac{-5}{9}.\frac{7}{23}+\frac{5}{23}:\frac{9}{7}\)
Bài 2: Tìm x, biết:
a, 20%x + 0,4x = 4,5
b, \(\left(3\frac{1}{2}-2\left|x-1\right|\right).2\frac{2}{3}=5\frac{1}{3}\)
HELP ME!
Cho:
\(A=4+\frac{1}{7^6}+\frac{3}{7}+\frac{4}{7^2}+\frac{-441}{7^6}+\frac{27}{7^5}\)
\(B=\frac{147}{7}+4+\frac{35}{7^7}+\frac{4}{7^2}+\frac{27}{7^5}+\frac{-9}{7^9}\)
Hãy so sánh A với B
\(\frac{2}{\frac{3}{\frac{-1}{ }-}}+\frac{2}{\frac{7}{\frac{3}{7}+}}-\frac{1}{\frac{14}{\frac{3}{28}}}\)