Câu hỏi của 32 Nguyễn Thu Trang

5A:b: \(47-\dfrac{\left(45\cdot24-5^2\cdot12\right)}{14}\)\(=47-\dfrac{1080-25\cdot12}{14}\)\(=47-\dfrac{1080-300}{14}=47-\dfrac{780}{14}=-\dfrac{61}{7}\)d: \(2345-1000:\left[19-2\left(2\cdot1-18^2\right)\right]\)\(=2345-1000:\left(19+2\cdot322\right)\)\(=2345-\dfrac{1000}{19+644}=2345-\dfrac{1000}{663}=\dfrac{1553735}{663}\)5B:b: \(50-\left[\left(20-2^3\right)\right]:2+34\)\(=84-\dfrac{20-8}{2}=84-6=78\)c: \(20-\left[30-\left(5-1\right)^2\right]:3\)\(=20-\dfrac{\left[30-4^2\right]}{3}\)\(=20-\dfrac{14}{3}=\dfrac{46}{3}\)d: \(205-\left[1200-\left(4^2-23\right)^3\right]:40\)\(=205-\left[1200-\left(16-23\right)^3\right]:40\)\(=205-\dfrac{\left[1200-\left(-7\right)^3\right]}{40}\)\(=205-\dfrac{1200+343}{40}\)\(=205-38,575=166,425\)Câu trả lời: 5A:b: \(47-\dfrac{\left(45\cdot24-5^2\cdot12\right)}{14}\)\(=47-\dfrac{1080-25\cdot12}{14}\)\(=47-\dfrac{1080-300}{14}=47-\dfrac{780}{14}=-\dfrac{61}{7}\)d: \(2345-1000:\left[19-2\left(2\cdot1-18^2\right)\right]\)\(=2345-1000:\left(19+2\cdot322\right)\)\(=2345-\dfrac{1000}{19+644}=2345-\dfrac{1000}{663}=\dfrac{1553735}{663}\)5B:b: \(50-\left[\left(20-2^3\right)\right]:2+34\)\(=84-\dfrac{20-8}{2}=84-6=78\)c: \(20-\left[30-\left(5-1\right)^2\right]:3\)\(=20-\dfrac{\left[30-4^2\right]}{3}\)\(=20-\dfrac{14}{3}=\dfrac{46}{3}\)d: \(205-\left[1200-\left(4^2-23\right)^3\right]:40\)\(=205-\left[1200-\left(16-23\right)^3\right]:40\)\(=205-\dfrac{\left[1200-\left(-7\right)^3\right]}{40}\)\(=205-\dfrac{1200+343}{40}\)\(=205-38,575=166,425\)