2 + -7/13 + -6/13
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`-3/7xx15/13-3/7xx11/13-3/7`
`=-3/7xx(15/13+11/13+1)`
`=-3/7xx3`
`=-9/7`
\(A=\frac{\left[\left(25-1\right):1+1\right]\left(25+1\right)}{2}=325.\)
\(B=\frac{\left[\left(51-3\right):2+1\right]\left(51+3\right)}{2}=675\)
\(C=\frac{\left[\left(81-1\right):4+1\right]\left(81+1\right)}{2}=861\)
X + 5/9 = 4/3
X = 4/3 - 5/9
X = 7/9
X - 4/9 = 1/2
X = 1/2 + 4/9
X = 17/18
6/13 + X = 7/6
X = 7/6 - 6/13
X = 55/78
13/5 - X = 5/6
X = 13/5 - 5/6
X= 53/30
X + 5/9 = 4/3
x = 4/3 - 5/9
x = 7/9
X - 4/9 = 1/2
x = 1/2 + 4/9
x = 17/18
6/13 + X = 7/6
x = 7/6 - 6/13
x - 55/78
13/5 - X = 5/6
x = 13/5 - 5/6
x = 53/30
\(\frac{5}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{6}\)
\(=\left(\frac{5}{6}+\frac{7}{6}\right)+\left(\frac{17}{9}+\frac{1}{9}\right)+\left(\frac{19}{13}+\frac{7}{13}\right)\)
\(=\frac{12}{6}+\frac{18}{9}+\frac{26}{13}\)
\(=2+2+2\)
\(=4+2\)
\(=6\)
\(\frac{5}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{6}.\)
\(=\left(\frac{5}{6}+\frac{7}{6}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{17}{9}+\frac{1}{9}\right)\)
\(=\frac{12}{6}+\frac{26}{13}+\frac{18}{9}\)
\(=2+2+2\)
\(=6\)
\(-\dfrac{5}{6}\cdot\dfrac{7}{13}+\dfrac{19}{13}:\dfrac{6}{-5}+\dfrac{2}{5}\)
\(=-\dfrac{5}{6}\cdot\dfrac{7}{13}+\dfrac{19}{13}\cdot-\dfrac{5}{6}+\dfrac{2}{5}\)
\(=-\dfrac{5}{6}\left(\dfrac{7}{13}+\dfrac{9}{13}\right)+\dfrac{2}{5}\)
\(=-\dfrac{5}{6}\cdot2+\dfrac{2}{5}\)
\(=-\dfrac{5}{3}+\dfrac{2}{5}\)
\(=-\dfrac{25}{15}+\dfrac{6}{15}\)
\(=-\dfrac{19}{15}\)
#データネ
B =3/2+ 7/6 + 13/12 + ... + 381/380 - Hoc24
CẤM ĐĂNG LẠI BÀI ĐÃ ĐƯỢC LÀM RỒI
2 + (-7/13) + ( -6/13)
= 2 - ( 7/13+6/13)
= 2 - 1
= 1