2/7+3/2. B)4/7nhân 4. C)7/8_2/5. D) 9/5:8/15 08/09/2021 Bởi Liliana 2/7+3/2. B)4/7nhân 4. C)7/8_2/5. D) 9/5:8/15
Đáp án+Giải thích các bước giải: $+)\dfrac{2}{7}+\dfrac{3}{2}=\dfrac{4}{14}+\dfrac{21}{14}=\dfrac{25}{14}\\+)\dfrac{4}{7}.4=\dfrac{16}{7}\\+)\dfrac{7}{8}-\dfrac{2}{5}=\dfrac{35}{40}-\dfrac{16}{40}=\dfrac{19}{40}\\+)\dfrac{9}{5}:\dfrac{8}{15}=\dfrac{9}{5}.\dfrac{15}{8}=\dfrac{27}{8}$ Bình luận
Đáp án: a,`2/7+3/2` `=4/14+21/14` `=25/14` b,` 4/7 xx 4` `=16/7` c,`7/8-2/5` `=35/40-16/40` `=19/40` d,`9/5:8/15` `=9/5 xx 15/8` `=27/5` XIN HAY NHẤT NHA @hoang Bình luận
Đáp án+Giải thích các bước giải:
$+)\dfrac{2}{7}+\dfrac{3}{2}=\dfrac{4}{14}+\dfrac{21}{14}=\dfrac{25}{14}\\+)\dfrac{4}{7}.4=\dfrac{16}{7}\\+)\dfrac{7}{8}-\dfrac{2}{5}=\dfrac{35}{40}-\dfrac{16}{40}=\dfrac{19}{40}\\+)\dfrac{9}{5}:\dfrac{8}{15}=\dfrac{9}{5}.\dfrac{15}{8}=\dfrac{27}{8}$
Đáp án:
a,`2/7+3/2`
`=4/14+21/14`
`=25/14`
b,` 4/7 xx 4`
`=16/7`
c,`7/8-2/5`
`=35/40-16/40`
`=19/40`
d,`9/5:8/15`
`=9/5 xx 15/8`
`=27/5`
XIN HAY NHẤT NHA
@hoang