\(=\dfrac{2^{45}\cdot7^{26}}{2^{30}\cdot7^{27}}=\dfrac{2^{15}}{7}\)
\(=\dfrac{2^{45}\cdot7^{26}}{2^{30}\cdot7^{27}}=\dfrac{2^{15}}{7}\)
Bài 1: Thực hiện phép tính sau:
\(a,\dfrac{9}{18}-\dfrac{-7}{12}+\dfrac{13}{32}\)
\(b,\dfrac{5}{-8}+\dfrac{14}{25}-\dfrac{6}{10}\)
CM: 3^15 - 9 ^6 chia hết cho 13
CM : 32^8-8^13 chia hết cho 72
\(\left(\dfrac{-2}{3}\right)^3:\left(\dfrac{-2}{3}\right)^2+\dfrac{2^{40.}3^{29}_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{_{--}}}}}}}}}}}}}}}}}}}}}}{8^{13}.9^{15}}\)
\(\dfrac{-5}{9}.15\dfrac{11}{13}-\dfrac{-5}{9}.11\dfrac{11}{13}+\dfrac{5}{9}\)
C/m rằng : a,( 10^19+10^18+10^17 ) chia hết 55; b, ( 81 ^7 - 27^9 - 9^13) chia hết cho 15; c, ( 4^13 + 32^5 - 8^8 ) chia hết cho 5 cảm ơn mn
C/m rằng : a,( 10^19+10^18+10^17 ) chia hết 55; b, ( 81 ^7 - 27^9 - 9^13) chia hết cho 15; c, ( 4^13 + 32^5 - 8^8 ) chia hết cho 5 cảm ơn mn
C/m rằng : a,( 10^19+10^18+10^17 ) chia hết 55; b, ( 81 ^7 - 27^9 - 9^13) chia hết cho 15; c, ( 4^13 + 32^5 - 8^8 ) chia hết cho 5 cảm ơn mn
A.(13 9/11 : 38/49 - 5 5/11 : 38/49): (49/38•5/11)
B.39 124/173•95 4/23 + 75 49/173•18/23-39 124/173•94 9/23
C.(7/12+1 25/31)•19 3/8 - 7 1/12 • 7 3/8
D.17/35•37 19/25 + 1 8/17 • 33 7/25 +(17/35-1 8/17)•32 6/25
Mong mọi người giúp mình các bài này.Mai phải nộp bài gấp
\(\frac{9^{15}.6^{30}}{27^{21}.8^{11}}\)
\(\frac{45^{12}.49^7}{35^{13}.27^8}\)
Tính (hợp lí nếu có thể)
\(\dfrac{1}{3}\) - \(\dfrac{3}{5}\) + \(\dfrac{5}{7}\) - \(\dfrac{7}{9}\) + \(\dfrac{9}{11}\) - \(\dfrac{11}{13}\) + \(\dfrac{13}{15}\) + \(\dfrac{11}{13}\) - \(\dfrac{9}{11}\) + \(\dfrac{7}{9}\) - \(\dfrac{5}{7}\) + \(\dfrac{3}{5}\) - \(\dfrac{1}{3}\)