Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
A= (1/3 - 1/3) + (-3/5 + 3/5) + (5/7 - 5/7) + (-7/9 + 7/9) + (9/11 - 9/11) - 11/13
A= -11/13
5/9 : (1/11 - 5/22) + 5/9 : (1/15 - 2/3)
= 5/9 : (2/22 - 5/22) + 5/9 : (1/15 - 10/15)
= 5/9 : (-3/22) + 5/9 : (--3/5)
= 5/9 . (-22/3) + 5/9 . (-5/3)
= 5/9 . [(-22/3) + (-5/3)]
= 5/9 . (-27/3)
= -5.
5/9 : ( 1/11 - 5/22 ) + 5/9 : ( 1/15 - 2/3 )
= 5/9 : -3/22 + 5/9 : -3/5
= 5/9 : (-3/22 + -3/5)
= 5/9 : -81/110
= -550/729
\(=\dfrac{5}{9}:\left(\dfrac{1}{15}-\dfrac{2}{3}+\dfrac{1}{11}-\dfrac{5}{22}\right)\)
\(=\dfrac{5}{9}:\dfrac{-81}{110}\)
\(=\dfrac{-5}{9}\cdot\dfrac{110}{81}=\dfrac{-550}{729}\)
\(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{2}{3}\right)=\frac{5}{9}:-\frac{3}{22}+\frac{5}{9}:-\frac{3}{5}=-\frac{110}{27}+-\frac{25}{27}=-5\)
5/9 : (2/22 -5/22) + 5/9 : (1/15 -10/15)
=5/9 : -3/22+5/9: -3/5
= -110/27+ -25/27
= -5
\(\frac{5}{9}:\frac{-3}{22}+\frac{5}{9}:\frac{-3}{5}\)
\(=\frac{5}{9}:\left(\frac{-3}{22}+\frac{-3}{5}\right)\)
\(=\frac{5}{9}:\frac{-81}{110}\)
\(=\frac{-550}{729}\)
\(\frac{5}{9}:\left(\frac{1}{11}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{2}{3}\right)\)
\(=\frac{5}{9}:\left(\frac{2}{22}-\frac{5}{22}\right)+\frac{5}{9}:\left(\frac{1}{15}-\frac{10}{15}\right)\)
\(=\frac{5}{9}:\frac{-3}{22}+\frac{5}{9}:\frac{-3}{5}\)
\(=\frac{5}{9}:\left(\frac{-3}{22}+\frac{-3}{5}\right)\)
\(=\frac{5}{9}:\frac{-81}{110}\)
\(=\frac{-550}{729}\)
`a)5/9:(1/11-5/22)+5/9:(1/15-2/3)`
`=5/9:(2/22-5/22)+5/9:(1/15-10/15)`
`=5/9:(-3)/22+5/9:(-9)/15`
`=5/9*(-22)/3+5/9*(-5)/3`
`=5/9*(-22/3+(-5)/3)`
`=5/9*(-9)=-5`
Thanks bn nhìu nha >.<