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\(\frac{2}{3}x\frac{4}{y}=\frac{4}{45}:\frac{1}{5}\)\(=\frac{4}{15}\)
\(\frac{4}{y}=\frac{4}{15}:\frac{2}{3}\)\(=\frac{2}{5}\)
y=4:\(\frac{2}{5}\) y=10
\(\frac{3}{4}x\frac{y}{5}=\frac{15}{4}\)
\(\frac{y}{5}=\frac{15}{4}:\frac{3}{4}=5\)
y=5x5=25
a) y = 5/14 : 6/7
y = 5/12
vậy y = 5/12
b) y = 4/9 x 2/3
y = 8/27
vậy t = 8/27
c) y = 1/2 - 3/10
y = 1/5
vậy y = 1/5
d) y = 5/6 - 1/3
y = 1/2
vậy y = 1/2
Bài 1:
a,Ta có:\(\frac{3}{5}=\frac{3\times2}{5\times2}=\frac{6}{10}\) (1)
\(\frac{4}{5}=\frac{4\times2}{5\times2}=\frac{8}{10}\) (2)
Từ (1) và (2)=> Một phân số tối giản nằm giữa hai phân số trên là:\(\frac{7}{10}\)
b,Ta có:\(\frac{3}{5}=\frac{3\times3}{5\times3}=\frac{9}{15}\)
\(\frac{4}{5}=\frac{4\times3}{5\times3}=\frac{12}{15}\)
=> hai phân số ở giữa là:\(\frac{10}{15}=\frac{2}{3};\frac{11}{12}\)
1
a )
( 9407 - 7274 ) : y = 8058 : 34
2133 : y = 237
y = 2133 : 237
y = 9
b )
y x 128 - y x 17 - y x 11 = 576000
y x ( 128 - 17 - 11 ) = 576000
y x 100 = 576000
y = 576000 : 100
y = 5760
2
a )
( 125 x 36 ) : ( 5 x 9 ) =
4500 : 45 =
100
b )
1/10 + 2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10=
( 1/10 + 9/10 ) + ( 2/10 + 8/10 ) + ( 3/10 + 7/10 ) + ( 4/10 + 6/ 10 ) + 5/10=
1 + 1 + 1 + 1 + 0,5 =
4,
Chúc bạn học giỏi nhé !
a.
x/y x 3/4 = 5/6 + 1/3
x/y x 3/4 = 7/6
x/y = 7/6 : 3/4
x/y = 14/9
b.
7/9 : x/y = 10/7 - 13/14
7/9 : x/y = 1/2
x/y = 7/9 : 1/2
x/y = 14/9
cho 1 k nha bn
\(a,y-\dfrac{3}{4}=\dfrac{5}{12}:\dfrac{10}{3}\\ \Rightarrow a,y-\dfrac{3}{4}=\dfrac{5}{12}.\dfrac{3}{10}\\ \Rightarrow y-\dfrac{3}{4}=\dfrac{1}{8}\\ \Rightarrow y=\dfrac{1}{8}+\dfrac{3}{4}\\ \Rightarrow y=\dfrac{7}{8}\\ b,\dfrac{1}{3}\times\left(\dfrac{2}{5}+\dfrac{3}{10}\right):\dfrac{14}{9}=\dfrac{1}{3}\times\left(\dfrac{4}{10}+\dfrac{3}{10}\right):\dfrac{14}{9}=\dfrac{1}{3}\times\dfrac{7}{10}\times\dfrac{9}{14}=\dfrac{3}{20}\)
a) y × 2/5 + y × 3/5 = 5/7
y x ( 2/5 + 3/5) = 5/7
y x 5/5 = 5/7
y x 1 = 5/7
y = 5/7 : 1
y = 5/7
b) y × 7/2 - y × 3/2 = 3/4
y x ( 7/2 - 3/2) = 3/4
y x 4/2 = 3/4
y x 2 = 3/4
y = 3/4 : 2
y = 3/4 x 1/2
y = 3/8
`a,yxx(2/5+3/5)=5/7`
`y xx1=5/7`
`y=5/7:1`
`y=5/7`
`b,y xx(7/2-3/2)=3/4`
`y xx2=3/4`
`y =3/4:2`
`y=3/2`
Bài 1:
a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)
\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{6}{7}\)
b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)
\(\Rightarrow x=\dfrac{1}{6}\)
\(a\times\dfrac{1}{5}+\dfrac{3}{10}+\dfrac{1}{2}\times a=500\\ a\times\left(\dfrac{1}{5}+\dfrac{1}{2}\right)=500-\dfrac{3}{10}\\ a\times\dfrac{7}{10}=\dfrac{4997}{10}\\ a=\dfrac{4997}{7}\)
\(y\times\dfrac{1}{2}+y:\dfrac{2}{3}=5\\ y\times\dfrac{1}{2}+y\times\dfrac{3}{2}=5\\ y\times2=5\\ y=\dfrac{5}{2}\)