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\(\dfrac{2}{5}\) x y : \(\dfrac{7}{4}\) = \(\dfrac{7}{8}\)
\(\dfrac{2}{5}\) x y = \(\dfrac{7}{8}\) x \(\dfrac{7}{4}\)
\(\dfrac{2}{5}\) x y = \(\dfrac{49}{32}\)
y = \(\dfrac{49}{32}\) : \(\dfrac{2}{5}\)
y = \(\dfrac{245}{64}\)
2\(\dfrac{2}{5}\): y x 1\(\dfrac{1}{4}\) = 2\(\dfrac{3}{5}\)
\(\dfrac{12}{5}\): y x \(\dfrac{5}{4}\) = \(\dfrac{13}{5}\)
\(\dfrac{12}{5}\): y = \(\dfrac{13}{5}\): \(\dfrac{5}{4}\)
\(\dfrac{12}{5}\): y = \(\dfrac{52}{25}\)
y = \(\dfrac{12}{5}\): \(\dfrac{52}{25}\)
y = \(\dfrac{15}{13}\)
bài 1
a, X/Y x 1/5=3/10
X/Y=3/10:1/5
X/Y=3/2
b, 3/4 x X/Y= 6/5
X/Y=3/4:6/5
X/Y=5/8
Bài 2:
a, > b, < c,= d,<
c)\(\dfrac{3}{8}\times\dfrac{5}{8}+y=\dfrac{5}{4}\)
\(\dfrac{15}{64}+y=\dfrac{5}{4}\)
\(y=\dfrac{5}{4}-\dfrac{15}{64}\)
\(y=\dfrac{65}{64}\)
d, \(\dfrac{3}{8}+\dfrac{5}{8}\times y=\dfrac{5}{4}\)
\(\dfrac{5}{8}\times y=\dfrac{5}{4}-\dfrac{3}{8}\)
\(\dfrac{5}{8}\times y=\dfrac{7}{8}\)
\(y=\dfrac{7}{8}:\dfrac{5}{8}\)
\(y=\dfrac{7}{5}\)
a, 3/4 x y = 3/5 + 3/10
3/4 x y = 9/10
y = 9/10 : 3/4
y = 6/5
b, 3/5 : y = 3/4 - 2/5
3/5 : y = 7/20
y = 3/5 : 7/20
y = 12/7
\(yX\frac{1}{2}X\frac{3}{4}+y:\frac{8}{5}-\frac{y}{2}=\frac{1}{2}\)
\(yX\frac{3}{8}+yX\frac{5}{8}-y:2=\frac{1}{2}\)
\(yX\left(\frac{3}{8}+\frac{5}{8}\right)-y:\frac{2}{1}=\frac{1}{2}\)
\(yX1-yX\frac{1}{2}=\frac{1}{2}\)
\(yX\left(1-\frac{1}{2}\right)=\frac{1}{2}\)
\(yX\frac{1}{2}=\frac{1}{2}\)
\(y=\frac{1}{2}:\frac{1}{2}\)
\(y=1\)
`y xx1/2+y xx1/4+y xx1/8=22/24`
`=>y xx (1/2+1/4+1/8)=11/12`
`=> y xx (4/8+2/8+1/8)=11/12`
`=> y xx 7/8=11/12`
`=>y=11/12:7/8`
`=>y=11/12xx8/7`
`=>y=22/21`
`y xx 1/2 + y xx 1/4 + y xx 1/8 = 22/24`
`=> y xx (1/2 + 1/4 + 1/8) = 11/12`
`=> y xx ( 4/8 + 2/8+ 1/8) = 11/12`
`=> y xx 7/8 = 11/12`
`=> y= 11/12 : 7/8`
`=> y=11/12 xx 8/7`
`=> y=22/21`