Phạm Minh Tuyết
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2024-12-22 09:14:33
a, \(\dfrac{5}{7}\) \(.\) \(\dfrac{5}{11}\) + \(\dfrac{5}{7}\) \(.\) \(\dfrac{6}{11}\) - \(\dfrac{5}{7}\) \(.\) \(\dfrac{4}{11}\)
= \(\dfrac{5}{7}\) \(.\) \((\dfrac{5}{11}\) + \(\dfrac{6}{11}\) - \(\dfrac{4}{11}\))
= \(\dfrac{5}{7}\) \(.\) \(\dfrac{7}{11}\)
= \(\dfrac{35}{77}\)
= \(\dfrac{5}{11}\)
b, 1,2 - 3\(^2\) + 7,5 : 3
= 1,2 - 9 + 7,5 :3
= -7,8 + 2,5
= - 5,3
2024-12-22 08:45:25
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2024-12-22 08:45:15
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2024-12-22 08:44:50
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2024-12-22 08:44:41
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2024-11-05 19:56:38
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2024-11-05 19:56:32
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