Tính nhanh
C = -7/813 + 496 x (-7/813) + (-7/813) x 316
A=-7/813+496×(-7/813)+(-7/813)×316
\(A=-\frac{7}{813}+496.-\frac{7}{813}+-\frac{7}{813}.316\)
\(A=-\frac{7}{813}.\left(1+496+316\right)\)
\(A=-\frac{7}{813}.813\)
\(A=-7\)
\(\frac{-7}{813}+496\cdot\frac{-7}{813}+\frac{-7}{813}\cdot316\)
ai nhanh nhất mình tik!thanks
= \(\frac{-7}{813}.\left(1+496+316\right)=\frac{-7}{813}.813=-7\)
tính nhanh
A = \(\frac{-7}{813}\)+ 496 . (\(\frac{-7}{813}\)) + (\(\frac{-7}{813}\)) . 316
B= \(\frac{-9}{10}\).\(\frac{5}{14}\)+ \(\frac{1}{10}\). (\(\frac{-9}{2}\))+ \(\frac{1}{7}\). (\(\frac{-9}{10}\))
a) \(A=\frac{-7}{813}+496.\left(\frac{-7}{813}\right)+\left(\frac{-7}{813}\right).316\)
\(=\frac{-7}{813}.\left(1+496+316\right)\)
\(=\frac{-7}{813}.813\)
\(=-7\)
b) \(B=\frac{-9}{10}.\frac{5}{14}+\frac{1}{10}.\left(\frac{-9}{2}\right)+\frac{1}{7}.\left(\frac{-9}{10}\right)\)
\(=\frac{-9}{10}.\left(\frac{5}{14}+\frac{1}{2}+\frac{1}{7}\right)\)
\(=\frac{-9}{10}.1\)
\(=\frac{-9}{10}\)
\(A=\left(\frac{1999}{2011}-\frac{2011}{1999}\right)-\left(\frac{-12}{1999}-\frac{12}{2011}\right)\) \(D=\frac{-7}{318}+496.\left(\frac{-7}{813}\right)+\left(\frac{-7}{813}\right).316\)
\(B=\frac{2}{5}\left(\frac{3}{11}+\frac{-2}{5}\right)\)
\(C=\frac{-5}{7}.\frac{4}{13}+\frac{-5}{7}.\frac{9}{13}+\frac{-2}{7}\) \(E=\frac{-9}{10}.\frac{5}{14}+\frac{1}{10}.\left(\frac{-9}{2}\right)+\frac{1}{7}.\left(\frac{-9}{10}\right)\)
Rút gọn biểu thức: a) x + 51 + (-56) + 24; b) (-65) - ( x + 27) + 26 c) 813 - ( 813 - x) + 213 d) 125 - (125 - x) + 22
37 x 275 x 813
\(=3^7\times\left(3^3\right)^5\times\left(2^3\right)^{13}=3^7\times3^{15}\times2^{39}=3^{22}\times2^{39}\)
3^7.27^5.8^13= 37.275.813= 8272275
37.275.813
=37.(33)5.813
=37.315.(23)13
=322.239
3^x+1 + 3^x+3 +3^x+5=813
\(3^{x+1}+3^{x+3}+3^{x+5}=813\)
\(3^x.3+3^x.3^3+3^x.3^5=813\)
\(3^x.\left(3+3^3+3^5\right)=813\)
\(3^x.\left(3+27+243\right)=813\)
\(3^x.273=813\) -> kiểm tra lại đề
Mình xin lỗi mình không giỏi kĩ thuât lắm nên dòng viết hơi sộc sệch
32^x = 813
Rút gọn:
A)
45 x 813
275x 83
Help!
\(4^5\cdot81^3\)
\(=\left(2^2\right)^5\cdot\left(3^4\right)^3\)
\(=2^{10}\cdot3^{12}\)
\(27^5\cdot8^3\)
\(=\left(3^3\right)^5\cdot\left(2^3\right)^3\)
\(=3^{15}\cdot2^8\)
này là phân số hay là gì vật bạn, bạn bấm vào kí hiệu \(\Sigma\) góc bên trái để có thể giúp các bạn trả lời đc câu hỏi mình nhé!
45x813=210x312
275x83=315x29