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a) \(\dfrac{5}{y}=\dfrac{1}{2}\)
\(y=\dfrac{5\times2}{1}=10\)
b) \(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{7}{5}\)
\(y=7\)
`5/y =1/2`
`=> 5*2=y`
`=> 10=y`
`=>y=10`
__
`42/25 : y/5 = 6/5`
`=>y/5 = 42/25 : 6/5`
`=>y/5 =42/25 xx 5/6`
`=>y/5 =7/5`
`=> y=7`
\(\dfrac{5}{y}=\dfrac{1}{2}\\ Vậy:y=\dfrac{5\times2}{1}=10\\ Vậy:y=10\\ ---\\ \dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\\ \dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{7}{5}\\ Vậy:y=7\)
A.y/5 x 3/7 x 3 = 27/35.
y/5 x 3/7 = 27/35 :3
y/5 x 3/7 = 9/35
y/5 = 9/35 :3/7
y /5 = 3/5
y ;5 = 3:5
y:5 = 0,6
y = 0,6 x5
y = 3
24/y=3/5*8/3
24/y=8/5
24:y=8/5
y=24;8/5
y=15
b,42/25:y/5=6/7
y/5=42/25:6/7
y/5=49/25
y:5=49/25
y=49/25*5
y=49/5=9,8
\(\frac{24}{y}:\frac{8}{3}=\frac{3}{5}\)
\(\Rightarrow\frac{24}{y}=\frac{3}{5}\times\frac{8}{3}\)
\(\Rightarrow\frac{24}{y}=\frac{8}{5}\)
\(\Rightarrow y=\frac{8}{5}\times24=\frac{192}{5}\)
b , \(\frac{42}{25}:\frac{y}{5}=\frac{6}{7}\)
\(\Rightarrow\frac{y}{5}=\frac{6}{7}\times\frac{42}{25}=\frac{36}{25}\)
\(\Rightarrow y=\frac{36}{25}\times5=\frac{36}{5}\)
a = y x 1/2 : 5/6
a = y x 3/5
b = 25 % : 20 % x y
b = 1/4 : 1/5 x y
b = 5/4 x y
Vì 3/5 < 1 < 5/4
=> 3/5 < 5/4
Hay a<b
_HT_
`a)5/y=1/2`
`5/y=5/10`
`y=10`
_______________________________
`b)42/25:y/5=6/5`
`y/5=42/25:6/5`
`y/5=7/5`
`y=7`