9*7*y / 72*63 = 5/6
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\(\frac{9\cdot7\cdot y}{72\cdot63}=\frac{5}{6}\)
Ta có : \(\frac{9\cdot7\cdot y}{9\cdot8\cdot7\cdot9}=\frac{5}{6}\)
\(\Rightarrow\frac{1\cdot y}{8\cdot9}=\frac{5}{6}\)
\(\Rightarrow\frac{1\cdot y}{72}=\frac{5}{6}\Rightarrow y=60\)
Do đó , y = 60
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9 x 6 = 54 9 x 7 = 63 9 x 5 = 45 9 x 8 = 72
54 : 9 = 6 63 : 9 = 7 45 : 9 = 5 72 : 9 = 8
54 : 6 = 9 63 : 7 = 9 45 : 5 = 9 72 : 8 = 9
9 x 6 = 54 9 x 7 = 63 9 x 5 = 45 9 x 8 = 72
54 : 9 = 6 63 : 9 = 7 45 : 9 = 5 72 : 9 = 8
54 : 6 = 9 63 : 7 = 9 45 : 5 =9 72 : 8 =9
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9 x 5 = 45
9 x 6 = 54
9 x 7 = 63
9 x 8 = 72
45 : 9 = 5
54 : 9 = 6
63 : 9 = 7
72 : 9 = 8
45 : 5 = 9
54 : 6 = 9
63 : 7 = 9
72 : 8 = 9
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\(9x7x\frac{y}{42}x63=\frac{5}{6}\)
\(3969x\frac{y}{42}=\frac{5}{6}\)
\(\frac{166698}{42}x\frac{y}{42}=\frac{35}{42}\)
\(166698\)x y=35
\(y=166698:35\)
y=4762,8
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