C=\(\frac{2}{4.7}-\frac{3}{5.9}+\frac{2}{7.10}-\frac{3}{9.13}+...........+\frac{2}{301.304}-\frac{3}{401.405}\)
Các bạn ơi trả lời giúp mình nhanh nhanh nha!
Ai trả lời đúng mình sẽ tick
Tính:
\(\frac{2}{4.7}\) - \(\frac{3}{5.9}\) + \(\frac{2}{7.10}\) - \(\frac{3}{9.13}\) + ... + \(\frac{2}{301.304}\) - \(\frac{3}{401.405}\)
A=\(\dfrac{2}{4.7}\)\(-\dfrac{3}{5.9}\)\(+\dfrac{2}{7.10}\)\(-\dfrac{3}{9.13}\)\(+.....\)\(+\dfrac{2}{301.304}\)\(-\dfrac{3}{401.405}\)
tính A
tính \(B=\frac{1}{4.7}+\frac{1}{7.10}+\frac{1}{10.13}.+....+\frac{1}{301.304}\)
\(C=\frac{2}{1.4}+\frac{2}{4.7}+\frac{2}{7.10}+.....+\frac{2}{601.604}\)tính
Tính tổng
\(B=\frac{2}{1.4}+\frac{2}{4.7}+\frac{2}{7.10}+...+\frac{2}{97.100}\)
So sánh A và B biết
a,A=6\(\left(x+\frac{1}{3}\right)^2\)
,B=-8-(3,75-x)2
b,A=\(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}+\frac{3}{13.16}\)
B=\(\left(\frac{1}{2}\right)^4\)
a) \(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{x\left(x+3\right)}\frac{125}{376}\left(x€N\cdot\right)\)
b) \(\frac{3}{4}x-14\frac{2}{3}:\left(\frac{11}{15}+\frac{1111}{3535}+\frac{111111}{636363}\right)=12\)
Tính tổng
\(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+...+\frac{3}{n\left(n+3\right)}\)