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![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)
\(\frac{2.3\left(1.2\right)+2.3\left(2.4\right)+2.3\left(3.6\right)+2.3\left(4.8\right)+2.3\left(5.10\right)}{3.4\left(3.4+6.8+9.12+12.16+15.20\right)}\)
\(=\frac{\left(3.4+6.8+9.12+12.16+15.20\right)}{2.3\left(3.4+6.8+9.12+12.16+15.20\right)}=\frac{1}{2.3}=\frac{1}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`25,2` giờ `:3`
`=8,4` giờ
`= 8` giờ `+ 0,4 `giờ
`= 8` giờ ` 24` phút
bạn xem lại đề ạ
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{6}{8}\) = \(\dfrac{6:2}{8:2}\) = \(\dfrac{3}{4}\)
\(\dfrac{3}{6}\) = \(\dfrac{3:3}{6:3}\) = \(\dfrac{1}{2}\)
\(\dfrac{8}{16}\) = \(\dfrac{8:8}{16:8}\) = \(\dfrac{1}{2}\)
\(\dfrac{12}{24}\) = \(\dfrac{12:12}{24:12}\) = \(\dfrac{1}{2}\)
\(\dfrac{15}{20}\) = \(\dfrac{15:5}{20:5}\) = \(\dfrac{3}{4}\)
Vậy \(\dfrac{6}{8}\) = \(\dfrac{15}{20}\)
Chọn d. \(\dfrac{15}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
12+24-(20-3):2 = 12+24-17:2
= 12+24-8,5
= 36-8,5
= 27,5
12+24-(20-3):2=9.5