`160/320=(160:10)/(320:10)=16/32=(16:2)/(32:2)=8/16=(8:2)/(16:2)=4/8=1/2`

Bài 2:
\(\dfrac{160}{320}=\dfrac{16}{x}=\dfrac{y}{16}=\dfrac{4}{z}=\dfrac{1}{2}\)
\(x=\dfrac{16\times320}{160}=32\)
\(y=\dfrac{16\times16}{32}=8\)
\(z=\dfrac{4\times2}{1}=8\)

Ở trên đấy ạ

Lời giải:

Giả sử mức ăn của mỗi người là $1$ suất/ ngày 

Số gạo dữ trữ ban đầu:

$120\times 20\times 1=2400$ (suất)

$150$ người ăn lượng gạo đó trong: $2400:150:1=16$ (ngày)

The villigers are kind and friendly

The villagers are kind and friendly.

Ha Noi is busy and noisy

HaNoi is busy and noisy

Life in my hometown is quiet and peaceful

`25/50=(25:25)/(50:25)=1/2`

`15/120=(15:15)/(120:15)=1/8`

`64/720=(64:16)/(720:16)=4/45`

`5/25=(5:5)/(25:5)=1/2`

`6/9=(6:3)/(9:3)=2/3`

`48/96=(48:48)/(96:48)=1/2`

`42/98=(42:14)/(98:14)= 3/7`

`18/30=(18:6)/(30:6)=3/5`

`80/240=(80:80)/(240:80)=1/3`

Bài 3:
\(\dfrac{25}{50}=\dfrac{25:25}{50:25}=\dfrac{1}{2}\)
\(\dfrac{15}{120}=\dfrac{15:15}{120:15}=\dfrac{1}{8}\)
\(\dfrac{64}{720}=\dfrac{64:16}{720:16}=\dfrac{4}{45}\)
\(\dfrac{5}{25}=\dfrac{5:5}{25:5}=\dfrac{1}{5}\)
\(\dfrac{6}{9}=\dfrac{6:3}{9:3}=\dfrac{2}{3}\)
\(\dfrac{48}{96}=\dfrac{48:48}{96:96}=\dfrac{1}{2}\)
\(\dfrac{42}{98}=\dfrac{42:14}{98:14}=\dfrac{3}{7}\)
\(\dfrac{18}{30}=\dfrac{18:6}{30:6}=\dfrac{3}{5}\)
\(\dfrac{80}{240}=\dfrac{80:80}{240:80}=\dfrac{1}{3}\)

bó tay lun tui đang định hỏi nè

B bấm vào chữ ''nộp bài '' là đc:>