Bn nào giúp mk bài này vs! Tối mk hk rồi!!!
\(B=\dfrac{30.4^7.3^{29}-5.4^{15}.2^{12}}{54.6^{14}.9^7-12.8^5.7^5}\)
Thank các bn nhìu!!
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Kq = 5/2 nha bạn câu này đã có người hỏi rồi bạn tự tham khảo nhé
Ta có: \(B=\dfrac{30\cdot4^7\cdot3^{29}-5\cdot14^5\cdot2^{12}}{54\cdot6^{14}\cdot9^7-12\cdot8^5\cdot7^5}\)
\(=\dfrac{3^{30}\cdot2^{15}\cdot5-5\cdot2^{17}\cdot7^5}{3^{31}\cdot2^{15}-2^{17}\cdot3\cdot7^5}\)
\(=\dfrac{2^{15}\cdot5\left(3^{30}-2^2\cdot7^5\right)}{3\cdot2^{15}\left(3^{30}-2^2\cdot7^5\right)}\)
\(=\dfrac{5}{3}\)
\(=\dfrac{3^{30}\cdot2^{15}\cdot5-5\cdot2^{17}\cdot7^5}{2^{14}\cdot3^{14}\cdot3^3\cdot2\cdot3^{14}-2^{15}\cdot7^5\cdot2^2\cdot3}\)
\(=\dfrac{2^{15}\cdot5\left(3^{30}-2^2\cdot7^5\right)}{2^{15}\cdot3^{31}-2^{17}\cdot7^5\cdot3}\)
\(=\dfrac{2^{15}\cdot5\left(3^{30}-2^2\cdot7^5\right)}{2^{15}\cdot3\left(3^{30}-2^2\cdot7^5\right)}=\dfrac{5}{3}\)
Mik ko chắc lắm đâu nha(/Mik làm tắc nên mất phấn tắc ra TSNT)
1: \(A=\dfrac{5\left(31-\dfrac{2}{7}-\dfrac{1}{11}+\dfrac{1}{23}\right)}{13\left(31-\dfrac{2}{7}-\dfrac{1}{11}+\dfrac{1}{23}\right)}+\dfrac{3\left(\dfrac{1}{5}+\dfrac{1}{13}-\dfrac{3}{10}\right)}{\dfrac{1}{13}+\dfrac{1}{5}-\dfrac{3}{10}}\)
=5/13+3
=5/13+39/13
=44/13
2: \(B=\dfrac{2^{15}\cdot3^{30}\cdot5-5\cdot2^5\cdot7^5\cdot2^{12}}{3^3\cdot2\cdot2^{14}\cdot3^{14}\cdot3^{14}-2^2\cdot3\cdot2^{15}\cdot7^5}\)
\(=\dfrac{5\cdot2^{15}\left(3^{30}-2^2\cdot7^5\right)}{3^{31}\cdot2^{15}-2^{17}\cdot3\cdot7^5}\)
\(=\dfrac{5\cdot2^{15}\left(3^{30}-2^2\cdot7^5\right)}{3\cdot2^{15}\cdot\left(3^{30}-2^2\cdot7^5\right)}=\dfrac{5}{3}\)
B = \(\dfrac{30.4^7.3^{29}-5.4^{15}.2^{12}}{54.6^{14}.9^7-12.8^5.7^5}\)
B=\(\dfrac{5.6.\left(2^2\right)^7.3^{29}-5.\left(2^2\right)^{15}.2^{12}}{9.5.\left(2.3\right)^{14}.\left(3^2\right)^7-\left(3.4\right).\left(2^3\right)^5.7^5}\)
B=\(\dfrac{5.\left(2.3\right).2^{14}.3^{19}-5.2^{30}.2^{12}}{3^2.5.2^{14}.3^{14}-3.4.2^{15}.7^5}\)
B=\(\dfrac{5.2^{15}.3^{20}-5.2^{30}.2^{12}}{5.2^{14}.3^{16}-3.2^{17}.7^5}\)
B=\(\dfrac{5.\left(2^{15}.3^{20}-2^{30}.2^{12}\right)}{2^{14}.\left(5.3^{16}-3.2^3.7^5\right)}\)
54=9.6 chứ bn