Toán 28/7+(-31/9) làm hộ mình mình vót cho 5 sao 29/11/2021 By Ayla 28/7+(-31/9) làm hộ mình mình vót cho 5 sao
$\frac{28}{7}$ + ($\frac{-31}{9}$ ) = 4 + $\frac{-31}{9}$ = $\frac{36}{9}$ + $\frac{-31}{9}$= $\frac{5}{9}$ # Ta là TTS # Trả lời
`28/7+(-31/9)` `=28/7-31/9` `=(28:7)/(7:7)-31/9` `= 4/1 – 31/9` `= (4×9)/(1×9) – 31/9` `= 36/9-31/9` `=5/9` Trả lời
$\frac{28}{7}$ + ($\frac{-31}{9}$ ) = 4 + $\frac{-31}{9}$ = $\frac{36}{9}$ + $\frac{-31}{9}$= $\frac{5}{9}$
# Ta là TTS #
`28/7+(-31/9)`
`=28/7-31/9`
`=(28:7)/(7:7)-31/9`
`= 4/1 – 31/9`
`= (4×9)/(1×9) – 31/9`
`= 36/9-31/9`
`=5/9`