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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
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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
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\(a,y-\dfrac{3}{4}=\dfrac{5}{12}:\dfrac{10}{3}\\ \Rightarrow a,y-\dfrac{3}{4}=\dfrac{5}{12}.\dfrac{3}{10}\\ \Rightarrow y-\dfrac{3}{4}=\dfrac{1}{8}\\ \Rightarrow y=\dfrac{1}{8}+\dfrac{3}{4}\\ \Rightarrow y=\dfrac{7}{8}\\ b,\dfrac{1}{3}\times\left(\dfrac{2}{5}+\dfrac{3}{10}\right):\dfrac{14}{9}=\dfrac{1}{3}\times\left(\dfrac{4}{10}+\dfrac{3}{10}\right):\dfrac{14}{9}=\dfrac{1}{3}\times\dfrac{7}{10}\times\dfrac{9}{14}=\dfrac{3}{20}\)
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a,
\(y:\dfrac{2}{5}=12\)
\(y=12\times\dfrac{2}{5}\)
\(y=\dfrac{24}{5}=4,8\)
b,
\(\dfrac{11}{10}+\dfrac{4}{5}\times\dfrac{3}{4}=\dfrac{11}{10}+\dfrac{12}{20}=\dfrac{22}{20}+\dfrac{12}{20}=\dfrac{34}{20}=\dfrac{17}{10}\)
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a, y x 8 = y + 10
=> 8y=y+10
=> 8y-y=10
=> 7y=10
=> y=10/7
b, y x 10 + 9 = y x 3 + 3
=> 10y+9=3y+3
=>10y+9-3y=3
=> 10y-3y+9=3
=> 10y-3y=3-9
=> 7y=-6
=> y=-6/7
:)
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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 !
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Bài làm :
Y = 11 - 10 + 9 - 8 + 7 - 6 + 5 - 4 + 3 - 2 + 1
Y = 1 + 1 + 1 + 1 + 1 + 1( có 6 chữ số = 1 )
=> Y = 1 x 6 = 6
Vậy Y = 6 nha!
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6/7 - y = 2/3 2/7 : y = 1/2 + 3/10
y = 6/7 - 2/3 2/7 : y = 4/5
y = 4/21 y = 2/7 : 4/5
y = 5/14
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y - \(\dfrac{2}{3}\) = \(\dfrac{3}{10}\) y + \(\dfrac{3}{4}\) = \(\dfrac{10}{3}\)
y = \(\dfrac{3}{10}\) + \(\dfrac{2}{3}\) y = \(\dfrac{10}{3}\) - \(\dfrac{3}{4}\)
y = \(\dfrac{29}{30}\) y = \(\dfrac{31}{12}\)