\(=\dfrac{3^{30}-11\cdot3^{22}}{2^2\cdot3^{28}}=\dfrac{3^{22}\cdot\left(3^8-11\right)}{2^2\cdot3^{28}}=\dfrac{6550}{4\cdot3^6}=\dfrac{3275}{1458}\)
Tính giá trị biểu thức:
\(A=\frac{11.3^{22}.3^7.9^{15}}{\left(2.3^{14}\right)^2}\)
Tính các gtri các biểu thức sau :
a, A = \(\frac{2^{10}.13+2^{10}.65}{2^8.104}\)
b,B=\(^{\frac{72^3.54^2}{108^4}}\)
c,C = \(\frac{11^{22}.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right)^2}\)
d, D= \(\frac{\left(3.4.2^{16}\right)}{11.2^{13}.4^{11}-16^9}\)
Bài 1:
a/ Tính N \(=\frac{5.\left(2^2.3^2\right)^9.\left(2^2\right)^6-2.\left(2^2.3\right)^{14}.3^6}{5.2^{28}.3^{19}-7.2^{29}.3^{18}}\)
b/ So sánh : \(\frac{2011.2012-1}{2011.2012}\) và \(\frac{2012.2013-1}{2012.2013}\);
\(\frac{-22}{45}\) ; \(\frac{-51}{133}\)và \(\frac{2^{225}}{3^{151}}\).
ai đang on giúp mk với nha, thanks nhìu
thực hiện phép tính( hợp lí nếu có thể)
\(\dfrac{-5}{9}+1\dfrac{5}{9}.\left(\dfrac{3}{4}-\dfrac{2}{5}\right):7^2\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{104}{195}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\)
\(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
tìm x
\(60\%x+0,4x+x:3=2\)
\(-2x-\dfrac{-3}{5}:\left(0,5\right)^2=-1\dfrac{1}{4}\)
\(\left(\dfrac{2}{3}-x\right):\dfrac{3}{4}=\dfrac{1}{5}\)
Tính
A=\(\left(\dfrac{1}{3}-1\right)\left(\dfrac{1}{6}-1\right)\left(\dfrac{1}{10}-1\right)\left(\dfrac{1}{15}-1\right)\left(\dfrac{1}{21}-1\right)\left(\dfrac{1}{28}-1\right)\left(\dfrac{1}{36}-1\right)\)
B=\(\left(1-\dfrac{1}{2^2}\right)\left(1-\dfrac{1}{3^2}\right)........\left(1-\dfrac{1}{10^2}\right)\)
C=\(1+\dfrac{1}{2}+\dfrac{1}{2^2}+\dfrac{1}{2^3}+..........+\dfrac{1}{2^{2016}}\)
Giúp mk nha!Cảm ơn rất nhìu!
BT2: Tính nhanh
7) \(-1\dfrac{5}{7}.15+\dfrac{2}{7}.\left(-15\right)+\left(-105\right).\left(\dfrac{2}{3}-\dfrac{4}{5}+\dfrac{1}{7}\right)\)
8) \(\dfrac{13}{29}\left(\dfrac{29}{5}-\dfrac{45}{8}\right)-\dfrac{45}{8}\left(\dfrac{9}{8}-\dfrac{13}{29}\right)\)
Các bạn giúp mk nhé! Thank!
Bài 1:Một số chia 7 dư 3,chia 17 dư 12,chia 23 dư 7.Hỏi số đó chia cho 2737 dư bao nhiêu?
Bài 2:Thực hiện phép tính
1-5-9+13+17-21-25+....+2001-2005-2009+20013
Bài 3:Tính
N=\(\dfrac{5.\left(2^2.3^2\right).\left(2^2\right)^6-2\left(2^2.3\right)^{14}.3^6}{5.2^{28}.3^{19}-7.2^{29}.3^{18}}\)
1:rút gọn
\(\dfrac{11\cdot3^{22}\cdot3^7-9^{15}}{\left(2\cdot3^{14}\right)^2}\)
2: tìm x
\(\dfrac{3\cdot\left(x-2\right)}{4}-\dfrac{2\cdot\left(1+2x\right)}{3}=1\dfrac{1}{4}-5\cdot\dfrac{\left(1+3x\right)}{6}-\dfrac{x-2}{12}\)
\(\left(1+\dfrac{2}{2.3}\right).\left(1+\dfrac{2}{3.4}\right).....\left(1+\dfrac{2}{n\left(n+1\right)}\right)\)
