(5+7+ 13+31 )E = 1/13 - 1/9 + 1/9 - 1/25 + 1/25 - 1/19 + 1/19 - 1/39
(5+7+ 13+31 )E = 1/13 - 1/39
(5+7+ 13+31 )E = 2/39
E = 2/39 : 56
E = 2/39 x 1/56
E = 2/2.184
\(\frac{-5}{9.13}-\frac{7}{9.25}-\frac{13}{19.25}-\frac{31}{19.69}\)
Tính hợp lí:
\(C=\left(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+...+\frac{112}{62.69}\right):\left(-\frac{5}{9.13}-\frac{7}{9.25}-\frac{13}{19.25}-\frac{31}{19.69}\right)\)
Tính
E= 5/9.13 + 7/9.25 + 13/19.25 + 31/19.69
E=5/9.13+7/9.25+13/19.25+31/19.69
\(\frac{\frac{3}{7}-\frac{3}{17}+\frac{3}{37}}{\frac{5}{7}-\frac{5}{17}+\frac{5}{37}}+\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}}{\frac{7}{5}-\frac{7}{4}+\frac{7}{3}-\frac{7}{2}}\) =?
\(\left(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{37.34}+....+\frac{112}{62.69}\right):\left(\frac{5}{9.13}-\frac{7}{19.25}-\frac{13}{19.25}-\frac{31}{19.69}\right)\)=?
Tính hợp lí:
a. A= \(\left(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+.....+\frac{112}{62.69}\right)\): \(\left(-\frac{5}{9.13}-\frac{7}{9.25}-\frac{13}{19.25}-\frac{31}{19.69}\right)\)
b. B= \(\frac{2.2016}{1+\frac{1}{1+2}+\frac{1}{1+2+3}+\frac{1}{1+2+3+4}+......+\frac{1}{1+2+3+4+.....+2016}}\)
c. C= \(\frac{2^{12}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4.3^5}-\frac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^9.14^3}\)
Giúp mk vs nha! Mai mk phải nộp rùi
tks m.n nhìu
a.(112/13.20 + 112/ 20.27 + 112/ 27.34 + ... +112/62.69 ) : ( -5/9.13 -7/ 9.25 - 13/19.25 - 31/19.69)
Tính bằng cách hợp lí. Ai giải nhanh mình tick cho
Tính:
-5/9.13 -7/9.25 - 13 / 9.25 - 31 / 19. 69
Bài 1:Thực hiện phép tính (hợp lí nếu có)
a,2.8^4.27^2+.6^9/2^7.6^7+27.40.9^4
b,(112/13.20+112/20.27+112/27.34+...+112/62.69):(5/9.13-7/9.25-13/19.25-31/19.69)
c,So sánh : A=1/2^1+1/2^2+...+1/2^49+1/2^50 với 1
