\(S2=\frac{5}{2\cdot7}+\frac{5}{7\cdot12}+\frac{5}{12\cdot17}+\frac{5}{17\cdot22}+\frac{5}{22\cdot27}\)
\(S2=\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{12}+\frac{1}{12}-\frac{1}{17}+\frac{1}{17}-\frac{1}{22}+\frac{1}{22}-\frac{1}{27}\)
\(S2=\frac{1}{2}-\frac{1}{27}\)
\(S2=\frac{52}{54}=\frac{26}{27}\)
CHÚC BN HC TỐT !!!!!!!!! TỨ DIỆP THẢO
B=5/2.7+5/7.12+5/12.17+5/17.22+5/22.29
5/2.7 + 5/7.12 + 5/12.17 + 5/17.22 + 5/22.27
/ là phâ`n
\(\frac{5}{2.7}+\frac{5}{7.12}+\frac{5}{12.17}+\frac{5}{17.22}+\frac{5}{22.29}=?\)
1) Tính nhanh
\(\frac{5}{2.7}+\frac{5}{7.12}+\frac{5}{12.17}+\frac{5}{17.22}+\frac{5}{22.27}+\frac{5}{27.32}+\frac{5}{32.37}\)
55/2.7+55/7.12+55/12.17+55/12.17+55/17.22=?[dấu chấm là nhân]
tính tổng:
5/2.7 + 5/7.12 + 5/12.17 + 5/22.27
nhanh tay nha mình tick
\(\frac{5}{2.7}.\frac{5}{7.12}.\frac{5}{12.17}...\frac{2}{907.1002}\)
Tính : \(N=2015+\frac{10}{2.7}+\frac{10}{7.12}+\frac{10}{12.17}+\frac{10.}{17.22}\)
Tính tổng:
C=\(\frac{3}{1.5}+\frac{3}{5.9}+\frac{3}{9.13}+...+\frac{3}{101.105}\)
D=\(\frac{4}{2.7}+\frac{4}{7.12}+\frac{4}{12.17}+...+\frac{4}{102.107}\)
E=\(\frac{5}{3.7}+\frac{5}{7.11}+\frac{5}{11.15}+...+\frac{5}{103.107}\)
F=\(\frac{6}{2.7}+\frac{6}{7.12}+\frac{6}{12.17}+...+\frac{6}{102.107}\)
