\(\frac{5}{2\cdot7}+\frac{5}{7\cdot12}+\frac{5}{12\cdot17}+\frac{5}{17\cdot22}+\frac{5}{22\cdot27}\)
\(=\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{12}+\frac{1}{12}-\frac{1}{17}+\frac{1}{17}-\frac{1}{22}+\frac{1}{22}-\frac{1}{27}\)
\(=\frac{1}{2}-\frac{1}{27}\)
\(=\frac{25}{54}\)
1) Tính nhanh
\(\frac{5}{2.7}+\frac{5}{7.12}+\frac{5}{12.17}+\frac{5}{17.22}+\frac{5}{22.27}+\frac{5}{27.32}+\frac{5}{32.37}\)
B=5/2.7+5/7.12+5/12.17+5/17.22+5/22.29
tính tổng:
5/2.7 + 5/7.12 + 5/12.17 + 5/22.27
nhanh tay nha mình tick
\(\frac{5}{2.7}+\frac{5}{7.12}+\frac{5}{12.17}+\frac{5}{17.22}+\frac{5}{22.29}=?\)
Tính tổng:
S2= 5/ 2.7 + 5/7.12+ 5/12.17 + 5/17.22 + 5/ 22. 27
Tìm x biết
5x/2.7 + 5x/7.12 + 5x/12.17 + 5x/17.22 + 5x/22.27 + 5x/27.32= 945
giải chi tiết giùm mình nha, cần gấp lắm
55/2.7+55/7.12+55/12.17+55/12.17+55/17.22=?[dấu chấm là nhân]
\(\frac{5}{2.7}.\frac{5}{7.12}.\frac{5}{12.17}...\frac{2}{907.1002}\)
Tính : \(N=2015+\frac{10}{2.7}+\frac{10}{7.12}+\frac{10}{12.17}+\frac{10.}{17.22}\)
