\(\frac{1}{2}+\frac{1}{-3}+\frac{1}{4}+\frac{1}{6}\)
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a= 1/2 + 1/4 + 1/8 - 1 x 1 + 8/1 - 4/1 - 2/1=\(1\frac{7}{8}\)=1,875
b=3/1 - 6/3 - 9/6 - 369/1 : 1/3 + 3/6 + 6/9 - 1/963 \(\approx\)186,665628245067
c=1/1 - 1/2 + 3/1 - 1/4 + 5/1 - 1/6 + 7/1 - 1/8 + 9/1 - 1/10=\(\approx\)23,8583333333333
vậy a>b>c
**************************l i k e***********************************8
A = \(\left(-\frac{1}{8}\right)\times\left(-13\right)=\frac{13}{8}\) => 0 < A < 2
B: Tử âm ; mẫu dương => B < 0
C = \(\left(\frac{1}{1}+\frac{3}{1}+\frac{5}{1}+\frac{7}{1}+\frac{9}{1}\right)-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}+\frac{1}{10}\right)\)
= 25 \(-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}+\frac{1}{10}\right)\)
Dễ có: B < A < C
a,Ta có \(\frac{\frac{1}{2}-\frac{1}{3}-\frac{1}{4}}{1-\frac{2}{3}-\frac{1}{2}}-\frac{\frac{3}{5}-\frac{3}{7}-\frac{3}{11}}{\frac{6}{5}-\frac{6}{7}-\frac{6}{11}}\)
\(=\frac{\frac{1}{2}-\frac{1}{3}-\frac{1}{4}}{2.\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{4}\right)}-\frac{3.\left(\frac{1}{5}-\frac{1}{7}-\frac{1}{11}\right)}{6.\left(\frac{1}{5}-\frac{1}{7}-\frac{1}{11}\right)}\)
=\(\frac{1}{2}-\frac{3}{6}=\frac{1}{2}-\frac{1}{2}=0\)
Vậy giá trị biểu thức bằng 0
b, Mình không hiểu cho lắm ạ , nếu ko phiền xin xem lại đầu bài ạ
-\(\frac{-2}{3}+\frac{3}{4}-\frac{-1}{6}+\frac{-2}{5}=-\frac{4}{6}+\frac{1}{6}+\frac{3}{4}-\frac{2}{5}=-\frac{2}{4}+\frac{3}{4}-\frac{2}{5}=\frac{1}{4}-\frac{2}{5}=-\frac{3}{20}\)
= \(-\frac{3}{20}\)
\(\frac{1}{2}+\frac{1}{-3}+\frac{1}{4}+\frac{1}{6}\)
\(=\frac{1}{2}+\frac{-1}{3}+\frac{1}{4}+\frac{1}{6}\)
\(=\frac{6}{12}+\frac{-4}{12}+\frac{3}{12}+\frac{2}{12}\)
\(=\frac{7}{12}\)
~Học tốt~
\(\frac{1}{2}+\frac{1}{-3}+\frac{1}{4}+\frac{1}{6}\)
\(=\left(\frac{1}{2}+\frac{1}{4}\right)+\left(\frac{1}{-3}+\frac{1}{6}\right)\)
\(=\left(\frac{1}{2}+\frac{1}{4}\right)+\left(-\frac{1}{3}+\frac{1}{6}\right)\)
\(=\left(\frac{2}{4}+\frac{1}{4}\right)+\left(-\frac{2}{6}+\frac{1}{6}\right)\)
\(=\frac{3}{4}+-\frac{1}{6}\)
\(=\frac{18}{24}+-\frac{4}{24}\)
\(=\frac{14}{24}=\frac{7}{12}\)