Toán ạ, 4/12 – 1/15= b, 2/3 + 15/8= d, 2/3 : 8/21= 13/09/2021 By Katherine ạ, 4/12 – 1/15= b, 2/3 + 15/8= d, 2/3 : 8/21=
Giải thích các bước giải: `a)``4/12-1/15``=1/3-1/15``=5/15-1/15``=4/15``b)``2/3+15/8``=16/24+45/24``=61/24``c)``2/3:8/21``=2/3 . 21/8``=7/4` Trả lời
a,$\frac{4}{12}$ -$\frac{1}{15}$ =$\frac{20}{60}$ -$\frac{4}{60}$ =$\frac{16}{60}$ =$\frac{4}{15}$ b,$\frac{2}{3}$ +$\frac{15}{8}$ =$\frac{16}{24}$ +$\frac{45}{24}$= $\frac{61}{24}$ c,$\frac{2}{3}$ :$\frac{8}{21}$ =$\frac{2}{3}$ x$\frac{21}{8}$ =$\frac{7}{4}$ Trả lời
Giải thích các bước giải:
`a)`
`4/12-1/15`
`=1/3-1/15`
`=5/15-1/15`
`=4/15`
`b)`
`2/3+15/8`
`=16/24+45/24`
`=61/24`
`c)`
`2/3:8/21`
`=2/3 . 21/8`
`=7/4`
a,$\frac{4}{12}$ -$\frac{1}{15}$ =$\frac{20}{60}$ -$\frac{4}{60}$ =$\frac{16}{60}$ =$\frac{4}{15}$
b,$\frac{2}{3}$ +$\frac{15}{8}$ =$\frac{16}{24}$ +$\frac{45}{24}$= $\frac{61}{24}$
c,$\frac{2}{3}$ :$\frac{8}{21}$ =$\frac{2}{3}$ x$\frac{21}{8}$ =$\frac{7}{4}$