Tính \(A=-\frac{19}{2^3.3^2.5}+\left(-3\frac{1}{2}\right)^2:1,2-\left(-1\frac{1}{3}\right)^3:\frac{5}{6}\)
Tính và Quy Đồng : \(\frac{4^2.5.11}{44.20};\frac{13.15.6}{18.65.7};\frac{7.2.8.5^2}{14.2.5}va\frac{2^3.3^2.5}{3.2^3.5^3}\)
Chứng minh rằng
\(A=\dfrac{8}{1^2.3^2}+\dfrac{16}{3^2.5^2}+\dfrac{24}{5^2.7^2}+...+\dfrac{120}{29^2.31^2}< 1\)
Tính giá trị biểu thức
P=\(\dfrac{2^{12}.3^5-4^6.9^2}{\left(2^3.3\right)^6+8^4.3^5}-\dfrac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^9.14^3}\)
N = \(\dfrac{6^6+6^3.3^3+3^6}{-73}\)
A=\(-\dfrac{68}{123}\)x\(-\dfrac{23}{79}\)
B=\(-\dfrac{14}{79}\)x\(-\dfrac{68}{7}\)x\(-\dfrac{46}{123}\)
C=\(-\dfrac{4}{19}\)x\(-\dfrac{3}{19}\)x\(-\dfrac{2}{19}\) ... \(\dfrac{2}{19}\)x\(\dfrac{3}{19}\)x\(\dfrac{4}{19}\)
a)So sánh A,B,C
b)Tính B:A
\(\dfrac{1}{2.5}+\dfrac{1}{5.8}+\dfrac{1}{8.11}+...+\dfrac{1}{92.95}+\dfrac{1}{95.98}\)
tính giá trị
a,\(\dfrac{\left(-3\right)^7.2^8}{6^7}\)
b,\(\dfrac{-3.7^4+7^3}{7^5.6-7^3.2}\)
c,\(\dfrac{5^3.3^5}{5^3.0.5+125.2.5}\)
\(\dfrac{19}{8}\)x\(\dfrac{16}{9}\)+\(\dfrac{19}{8}\)x\(\dfrac{2}{9}\)-\(\dfrac{19}{8}\)