Question

tính tổng (1-1/3)(1-1/6)(1-1/10)(1-1/15). ... .(1-1/780)

Answer 1

tính tích mà bạn

Answer 2

(1-1/3) x (1-1/6) x (1-1/10) x (1-1/15)x ...x (1-1/780)

=2/3x 5/6 x 9/10 x...x 779/780

=4/6 x 10/12 x 18/20 x ...x 1558/1560

=4x10 x 18 x...x 1558/6x 12 x 20 x ...x 1560

= 41/39x 3

= 41/11

Answer 3

tính: (1-1/3).(1-1/6).(1-1/10).(1/15)....(1-1/780)

Answer 4

Bạn Nguyễn Huy Thắng lm đúg òi đó!

Answer 5

\(\left(1-\frac{1}{3}\right)\left(1-\frac{1}{6}\right)\left(1-\frac{1}{10}\right)......\left(1-\frac{1}{780}\right)\)

\(=\frac{2}{3}.\frac{5}{6}.\frac{9}{10}......\frac{779}{780}=\frac{4}{6}.\frac{10}{12}.\frac{18}{20}.....\frac{1558}{1560}\)

\(=\frac{1.4}{2.3}.\frac{2.5}{3.4}.\frac{3.6}{4.5}.....\frac{38.41}{39.40}\)

\(=\frac{\left(1.2.3.....38\right)\left(4.5.6.....41\right)}{\left(2.3.4.....39\right)\left(3.4.5.....40\right)}=\frac{1.41}{39.3}=\frac{41}{117}\)

Answer 6

cho mình hỏi sao nhân với 3 thế

Answer 7

X x 4 + 35719 = 45779

Answer 8

\(\frac{41}{117}\)nhé bạn