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a/ x không co giá tri là số tu nhien nào
b/ x = 6,4; 6,5; 6,6
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quy đồng 55/8=495/72
64/9=512/72
các số trên là 496,497,498,...,511
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x - 5 / 6 = 12 / 7
x = 12 / 7 + 5 / 6
x = 107 / 42
x + 4 / 5 = 8 / 3
x = 8 / 3 - 4 / 5
x = 28 / 15
x * 3 / 9 = 11 / 7 - 3 / 4
x * 3 / 9 = 23 / 28
x = 23 / 28 : 3 / 9
x = 69 / 28
5 / 9 : x = 1 / 3 + 2 / 5
5 / 9 : x = 11 / 15
x = 5 / 9 : 11 / 15
x = 25 / 33
\(1\frac{3}{4}-x=\frac{3}{8}\)
x = 11 / 8
15 , 21 - x = 5 , 6 + 1 , 2
15 , 21 - x = 6 , 8
x = 15 , 21 - 6 , 8
x = 8 , 41
C1 : ( 6 , 75 + 3 , 25 ) * 42
= 10 * 42
= 420
C 2 : ( 6 , 75 + 3 , 25 ) * 42
= 6,75 * 42 + 3,25 * 42
= 283 , 5 + 136 , 5
= 4200
C 1 : ( 9 , 6 - 4 , 2 ) * 3 , 6
= 5 , 4 * 3 , 6
= 19 , 44
C 2 : ( 9 , 6 - 4 , 2 ) * 3 , 6
= 9 , 6 * 3 , 6 - 4 , 2 * 3 , 6
= 34 , 56 - 15 , 12
= 19 , 44
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Ta có:
\(\frac{55}{8}=6\frac{7}{8}\) < x < \(\frac{64}{9}=7\frac{1}{9}\)
=> 6 < \(6\frac{7}{8}\) < x = 7 < \(7\frac{1}{9}\)
Vậy x = 7.
Ta có : \(\frac{55}{8}=6\frac{7}{8}\); \(\frac{64}{9}=7\frac{1}{9}\) => x = 7
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Số đặt ở dấu chấm hỏi là : 14