Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,\frac{5\cdot6+5\cdot7}{5\cdot8+20}=\frac{\left(5\cdot6+5\cdot7\right)\div2}{\left(5.8+20\right)\div2}=\frac{13}{12}\)
\(\frac{8.9-4.15}{12.7-180}=\frac{12.6-12.5}{12.7-12.15}=\frac{1}{-8}=\frac{-1}{8}\)
\(Ta\)\(co\)\(\frac{13}{12}=\frac{13.2}{12.2}=\frac{26}{24}\)
\(\frac{-1}{8}=\frac{3\left(-1\right)}{3.8}=\frac{-3}{24}\)
Phần b bạn tính ra rồi làm tương tự phần a nha chúc bạn học giỏi!!!
\(\frac{7.4^5.3^{11}+2^{13}.9^5}{6^{10}+2^{12}.3^{10}}=\frac{7.\left(2^2\right)^5.3^{11}+2^{13}.\left(3^2\right)^5}{\left(2.3\right)^{10}+2^{12}.3^{10}}=\frac{7.2^{10}.3^{11}+2^{13}.3^{10}}{2^{10}.3^{10}+2^{12}.3^{10}}\)
\(=\frac{2^{10}.3^{10}.\left(7.3+2^3\right)}{2^{10}.3^{10}.\left(1+2^2\right)}=\frac{7.3+2^3}{1+2^2}=\frac{29}{5}\)
Câu 1:
A = \(\frac{25.9-25.17}{-8.80-8.10}\)
A = \(\frac{25.\left(9-17\right)}{-8.10\left(8+1\right)}\)
A = \(\frac{5.5.\left(-8\right)}{-8.10.9}\)
A = \(\frac{5.5.2.4}{2.4.5.2.9}\)
A = \(\frac{5}{18}\)
B = \(\frac{48.12-48.15}{-3.270-3.30}\)
B = \(\frac{48.\left(12-15\right)}{-3.30\left(9+1\right)}\)
B = \(\frac{6.8.\left(-3\right)}{-3.30.10}\)
B = \(\frac{6.2.4.\left(-3\right)}{-3.5.6.2.5}\)
B = \(\frac{4}{25}\) = \(\frac{20}{125}\) < \(\frac{20}{72}\) = \(\frac{5}{18}\)
A > B
Câu 2:
A = \(\frac{2^5.7+2^5}{2^5-2^5.3}\)
A = \(\frac{2^5.\left(7+1\right)}{2^5-2^5.3}\)
A = \(\frac{2^5.8}{2^5.\left(1-3\right)}\)
A = \(\frac{8}{-2}\)
A = -4
B = \(\frac{3^4.5-3^6}{3^4.13+3^4}\)
B = \(\frac{3^4.\left(1-3^2\right)}{3^4.\left(13+1\right)}\)
B = \(\frac{1-9}{14}\)
B = \(\frac{-8}{14}\)
B = \(\frac{-4}{7}\) > - 4
Vậy A < B
5^4-3/100=1/20
3^3+2+1/3*13=3^5/13
5.3^7-5/5.3^5-3=1
2^15+14+13/2^13+12+11=2^6