=13/15+13/35+ 13/63+13/99
=13/3*5+13/5*7+13/7*9+13/9*11
=13*1/2 (1/3-1/5+1/5+1/5 -1/7+ 1/7-1/9+1/9-1/11)
=13/2*(1/3-1/11)
=13/2*8/33
=52/33
=13/15+13/35+ 13/63+13/99
=13/3*5+13/5*7+13/7*9+13/9*11
=13*1/2 (1/3-1/5+1/5+1/5 -1/7+ 1/7-1/9+1/9-1/11)
=13/2*(1/3-1/11)
=13/2*8/33
=52/33
D =131313/151515+131313/353535+131313/636363+131313/999999
131313/151515+ 131313/353535+131313/636363+131313/999999)*33
Thực hiện phép tính:131313/151515+131313/353535+131313/636363+131313/999999
Tính nhanh :
\(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
Tính nhnah: \(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
Tính nhanh:
a)\(\frac{131313}{151515}+ \frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
b)\(\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+...+\frac{1}{2017\times2018}\)
c)\(\frac{1}{3\times5}+\frac{1}{4\times7}+\frac{1}{7\times9}+...\frac{1}{2015\times2017}+\frac{1}{2017\times2018}\)
tính nhanh nha
D=\(\frac{3}{2x4}+\frac{3}{4x6}+...+\frac{3}{98x100}\)
A=\(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}+\frac{1}{12}\)
B=\(6\frac{2}{3}+7\frac{5}{8}+3\frac{1}{3}+4\frac{5}{8}\)
C=[\(4\frac{2}{5}+2\frac{3}{7}\)] - [\(2\frac{2}{5}-1\frac{4}{7}\)]
E=\(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
làm ơn giúp mik nha
mik đang cần gấp
mik sẽ tick(chắc chắn lun) cho người nhanh nhất
\(\frac{131313}{151515}+\frac{131313}{353535}+\frac{131313}{636363}+\frac{131313}{999999}\)
Các bạn giải giúp mình nha. bạn nào giải được mình tik cho
131313/151515+131313/353535+131313/636363+131313/9999