\(\left(\frac{1}{9}\right)^{40}:\left(\frac{1}{3}\right)^{10}=\frac{1}{9^{40}}\cdot\frac{3^{10}}{1}=\frac{3^{10}}{\left(3^2\right)^{40}}=\frac{3^{10}}{3^{80}}=\frac{1}{3^{70}}\)
1/Tính A=\(0,5^3+1^3+1,5^3+...+5^3\)
biết \(1^3+2^3+3^3+...+10^3=3025\)
2/Tính:
\(\left(\frac{16}{3}-\sqrt{\frac{40}{9}}^{^0}\right)\left(\frac{17}{3}-\sqrt{\frac{40}{9}}^0\right)...\left(\frac{30}{3}-\sqrt{\frac{40}{9}}^0\right)\)
1/Tính họp lí(nếu có thể):
a, \(5-\frac{1}{3}-1\frac{2}{3}+\frac{1}{2}\)\
b,\(\frac{3}{2}.\frac{4}{9}-\frac{1}{5}-\frac{2}{15}\)
c,\(\frac{25^{21}.7^{30}}{5^{40}.49^{15}.10}\)
d,\(\frac{3^{18}.25^5}{15^{10}.27^3}\)
Giup vs mk pải nộp gấp
So sánh:
a) \(\frac{n}{3.n+1}\)và \(\frac{2.n}{6.n+1}\)
b) A= \(\frac{10^7+1}{10^8+1}\)và B= \(\frac{10^8+1}{10^9+1}\)
mau nha các bạn cần gấp 
A=\(\frac{10-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-...-\frac{10}{18}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+...+\frac{1}{90}}\)
P=\(\frac{\frac{9}{1}+\frac{8}{2}+\frac{7}{3}+...+\frac{1}{9}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{10}}\)
Tính P
Bà 18 : Thực hiện các phép tính sau = cách hợp lý nhất :
a) ( -40/51 . 0,32 . 17/20 ) : 64/75
b) -10/11 . 8/9 + 7/18 . 10/11
c) 3/14 : 1/28 - 13/21 : 1/28 + 29/42 : 1/28 - 8
d) \(-1\frac{5}{7}.15+\frac{2}{7}.\left(-15\right)+\left(-105\right).\left(\frac{2}{3}-\frac{4}{5}+\frac{1}{7}\right)\)
Tìm A:B, biết:
A=\(\frac{9}{1}+\frac{8}{2}+\frac{7}{3}+\frac{6}{4}+\frac{5}{5}+\frac{4}{6}+\frac{3}{7}+\frac{2}{8}+\frac{1}{9}\)
B=\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{9}+\frac{1}{10}\)
Tính \(\frac{1}{2}-\frac{1}{3}-\frac{2}{3}+\frac{1}{4}+\frac{2}{4}+\frac{3}{4}-\frac{1}{5}-\frac{2}{5}-\frac{3}{5}-\frac{4}{5}+...+\frac{1}{10}+...+\frac{9}{10}\)
Tính\(\frac{\frac{9}{1}+\frac{8}{2}+...+\frac{1}{9}}{\frac{1}{2}+\frac{1}{3}+...+\frac{1}{10}}\)
