Thực hiện phép tính a, 2/3 + 3/4 . (-4/9) b, 5/13 – 9/19+2013 – 8/17+8/13 c, (-3).1/3 – √81 + 3 mũ 3 : 3 mũ 2 24/11/2021 Bởi Mary Thực hiện phép tính a, 2/3 + 3/4 . (-4/9) b, 5/13 – 9/19+2013 – 8/17+8/13 c, (-3).1/3 – √81 + 3 mũ 3 : 3 mũ 2
a, 2/3 + 3/4 . (-4/9) =2/3 + (-1/3) =1/3 b,5/13 – 9/19+2013 – 8/17+8/13 =2013 c, (-3).1/3 – √81 + 3 mũ 3 : 3 mũ 2 =-1-9+27:9 =-1-9+3 =-7 Bình luận
`a, 2/3 + 3/4 . (-4/9)` `=2/3 + (-1/3)` `=1/3` sai đề `b,5/13 – 9/17+2013 – 8/17+8/13` `=(5/13+8/13)-(9/17+8/17)+2013` `=1-1+2013` `=2013` `c, (-3).1/3 – √81 + 3 ^3 : 3 ^ 2` `=-1-9+27:9` `=-1-9+3` `=-7` Bình luận
a, 2/3 + 3/4 . (-4/9)
=2/3 + (-1/3)
=1/3
b,5/13 – 9/19+2013 – 8/17+8/13
=2013
c, (-3).1/3 – √81 + 3 mũ 3 : 3 mũ 2
=-1-9+27:9
=-1-9+3
=-7
`a, 2/3 + 3/4 . (-4/9)`
`=2/3 + (-1/3)`
`=1/3`
sai đề
`b,5/13 – 9/17+2013 – 8/17+8/13`
`=(5/13+8/13)-(9/17+8/17)+2013`
`=1-1+2013`
`=2013`
`c, (-3).1/3 – √81 + 3 ^3 : 3 ^ 2`
`=-1-9+27:9`
`=-1-9+3`
`=-7`