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a) \(x+\dfrac{4}{9}=\dfrac{5}{27}\)
\(x=\dfrac{5}{27}-\dfrac{4}{9}\)
\(x=-\dfrac{7}{27}\)
b) \(x-\dfrac{4}{11}=\dfrac{7}{33}\)
\(x=\dfrac{7}{33}+\dfrac{4}{11}\)
\(x=\dfrac{19}{33}\)
c) \(\dfrac{8}{5}-x=\dfrac{1}{3}\times\dfrac{2}{5}\)
\(\dfrac{8}{5}-x=\dfrac{2}{15}\)
\(x=\dfrac{8}{5}-\dfrac{2}{15}\)
\(x=\dfrac{22}{15}\)
d) \(x-\dfrac{3}{4}=\dfrac{1}{2}+\dfrac{2}{6}\)
\(x-\dfrac{3}{4}=\dfrac{5}{6}\)
\(x=\dfrac{5}{6}+\dfrac{3}{4}\)
\(z=\dfrac{19}{12}\)
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11 x 11 = ( 1 + 1 ) x ( 1 + 1 ) = 4
22 x 22 = ( 2 + 2 ) x ( 2 + 2 ) = 16
Vậy :
33 x 33 = ( 3 + 3 ) x ( 3 + 3 ) = 36
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\(=\dfrac{3}{9}\cdot\dfrac{9}{11}\cdot\dfrac{22}{25}\cdot\dfrac{5}{7}\cdot\dfrac{7}{10}=\dfrac{3}{11}\cdot\dfrac{22}{25}\cdot\dfrac{5}{10}=3\cdot2\cdot\dfrac{1}{2}\cdot\dfrac{1}{5}=\dfrac{3}{5}\)
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9 / 11 - x : 2 / 3 = 5 / 22
>= 9 / 11 - ( x : 2 / 3 ) = 5 / 22
>= 9 / 11 - 5 / 22 = x : 2 / 3
>= 13 / 22 = x : 2 / 3
>= x = 39 / 44
x : 2/3 = 9/11 - 5/22
x : 2/3 = 13/22
x = 13/22 * 2/3
x = 13/33
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a. 11 x11= 121 ; 22 x 22=484 , b.44 x 44 = 1936 ; 55 x 55 = 3025
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\(=\dfrac{8}{22}\cdot\dfrac{7}{9}+\dfrac{5}{9}\cdot\dfrac{8}{11}-\dfrac{8}{9}\cdot\dfrac{4}{11}\)
\(=\dfrac{8}{9}\left(\dfrac{7}{22}+\dfrac{5}{11}-\dfrac{4}{11}\right)=\dfrac{8}{9}\cdot\dfrac{9}{22}=\dfrac{4}{11}\)
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1, =4/9 x (3/7 + 2 x 4/7) - 1/9 - 3/9
= 4/9 x 1 - 1/9 - 3/9 = 0
2, = ( 22/5 x 5/22 ) x 12
= 1 x 12 = 12
a)\(x:\frac{9}{22}=44\) b)\(x:\frac{5}{11}=33\) c)\(x:\frac{4}{33}=22\)
\(x\) \(=44\times\frac{9}{22}\) \(x\) \(=33\times\frac{5}{11}\) \(x\) \(=22\times\frac{4}{33}\)
\(x\) \(=18\) \(x\) \(=15\) \(x\) \(=\frac{8}{3}\)
A) X : 9/22 = 44
X=44x9/22
X=18
B) X : 5/11 = 33
X=33x5/11
X=15
C) X : 4/33 = 22
X=22x4/33
X=8/3