Tìm y
1/8:y=1/5
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`b)y:12/15=5`
`\qquad y:4/5=5`
`\qquad y=5*4/5=4`
Vậy `y=4`
`a)y-1/8=1/4`
`\qquad y=1/4+1/8`
`\qquad y=3/8`
Vậy `y=3/8`
Giải:
a) \(y-\dfrac{1}{8}=\dfrac{1}{4}\)
\(y=\dfrac{1}{4}+\dfrac{1}{8}\)
\(y=\dfrac{3}{8}\)
b) \(y:\dfrac{12}{15}=5\)
\(y=5\times\dfrac{4}{5}\)
\(y=4\)
Chúc em học tốt!
\(\dfrac{2}{5}\) 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 = \(\dfrac{15}{13}\)
\(3\dfrac{1}{2}:y=\dfrac{8}{5}\\ \dfrac{7}{2}:y=\dfrac{8}{5}\\ y=\dfrac{7}{2}:\dfrac{8}{5}\\ y=\dfrac{7}{2}\times\dfrac{5}{8}\\ y=\dfrac{35}{16}\)
Vậy `y=35/16`
a: =>4y+15/16=1
=>4y=1/16
hay y=1/64
b: =>10y+1023/1024=1
=>10y=1/1024
hay y=1/10240
a: A=-(x-7)^2-888<=-888
Dấu = xảy ra khi x=7
b: \(B=\left|2x-1\right|+\left|y-5\right|+\dfrac{8}{3}>=\dfrac{8}{3}\)
Dấu = xảy ra khi x=1/2 và y=5
c: \(C=\left(x+3\right)^2+\left|2y-5\right|-232>=-232\)
Dấu = xảy ra khi x=-3 và y=5/2
\(a,\frac{x}{8}-\frac{1}{y}=\frac{1}{4}\)
\(\Rightarrow\frac{1}{y}=\frac{x}{8}-\frac{1}{4}\)
\(\Rightarrow\frac{1}{y}=\frac{x-2}{8}\)
\(\Rightarrow\left(x-2\right)\cdot y=1\cdot8\)
\(\Rightarrow y\left(x-2\right)=8\)
xét bảng :
x-2 | -1 | 1 | -2 | 2 | -4 | 4 | -8 | 8 |
y | -8 | 8 | -4 | 4 | -2 | 2 | -1 | 1 |
x | 1 | 3 | 0 | 4 | -2 | 6 | -6 | 10 |
vậy_
b, tương tự
\(a,\frac{x}{8}-\frac{1}{y}=\frac{1}{4}\)
\(\Leftrightarrow\frac{1}{y}=\frac{x}{8}-\frac{1}{4}\)
\(\Leftrightarrow\frac{1}{y}=\frac{x}{8}-\frac{2}{8}\)
\(\Leftrightarrow\frac{1}{y}=\frac{x-2}{8}\)
\(\Leftrightarrow y(x-2)=8\)
Vì \(x,y\inℤ\)nên \(x-2\inℤ\), ta có bảng sau:
y | 1 | -1 | 2 | -2 | 4 | -4 | 8 | -8 |
x - 2 | -8 | 8 | -4 | 4 | -2 | 2 | -1 | 1 |
x | -6 | 10 | -2 | 6 | 0 | 4 | 1 | 3 |
`1/8 : y=1/5`
`=> y=1/8 : 1/5`
`=> y=1/8 xx 5`
`=>y=5/8`
\(\dfrac{1}{8}:y=\dfrac{1}{5}\)
\(y=\dfrac{1}{8}:\dfrac{1}{5}\)
\(y=\dfrac{5}{8}\)
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