Đoàn Ngọc Hoàng Nghi
Giới thiệu về bản thân
ngày nào cũng on hết á
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2025-03-01 14:24:53
a)\(\dfrac{-5}{9}\)+\(\dfrac{8}{15}\)+\(\dfrac{-2}{11}\)+\(\dfrac{4}{-9}\)+\(\dfrac{7}{15}\)
=\(\dfrac{-9}{9}\)+\(\dfrac{15}{15}\)+\(\dfrac{-2}{11}\)
=-1+1+\(\dfrac{-2}{11}\)
=0+\(\dfrac{-2}{11}\)
=\(\dfrac{-2}{11}\)
b)(\(\dfrac{7}{2}\).\(\dfrac{5}{6}\))+(\(\dfrac{7}{6}\):\(\dfrac{2}{7}\))
=\(\dfrac{7}{2}\).(\(\dfrac{5}{6}\)+\(\dfrac{7}{6}\))
=\(\dfrac{7}{2}\).\(2\)
=7
2025-03-01 11:46:51
a/Có -3/8=-9/24;5/-12=-10/12
Vì -9/24>-10/24 nên -3/8>5/-12
b/Có 3131/5252=31/53
Vậy 3131/5252=31/52