=[2/3+2/99]+[2/35+2/63]+2/15

=24/99+[4/45+2/15]

=24/99+2/9

=46/99

\(=\frac{2}{1\times3}+\frac{2}{3\times5}+\frac{2}{5\times7}+\frac{2}{7\times9}+\frac{2}{9\times11}\)

\(=\frac{1}{2}\times\left(\frac{2}{1}-\frac{2}{3}+\frac{2}{3}-\frac{2}{5}+\frac{2}{5}-\frac{2}{7}+\frac{2}{7}-\frac{2}{9}+\frac{2}{9}-\frac{2}{11}\right)\)

\(=\frac{1}{2}\times\frac{20}{11}=\frac{10}{11}\)

2/3 + 2/15 + 2/35 + 2/63 + 2/99 = 10/11

Cho mình nhé

\(\left(\frac{2}{15}+\frac{2}{35}+\frac{2}{63}\right).Y=4\)

\(\Rightarrow\frac{2}{9}.Y=4\)

\(\Rightarrow Y=4:\frac{2}{9}\)

\(\Rightarrow Y=18\)

Vậy số cần tìm là 18.

~Study well~

\(\left(\frac{2}{15}+\frac{2}{35}+\frac{2}{63}\right).y=4\)

\(\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}\right).y=4\)

\(\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}\right).y=4\)

\(\left(\frac{1}{3}-\frac{1}{9}\right).y=4\)

\(\frac{2}{9}.y=4\)

\(y=18\)

Vậy \(y=18\)

dấu chấm là nhân nhé 

\(-2\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+\frac{1}{99}+...+\frac{1}{9999}\right)\)

\(=-2\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}+\frac{1}{99.101}\right)\)\(=-2\cdot\left(\frac{1}{3}-\frac{1}{101}\right)\)

=.....

mình quên đem máy tính nên k ghi đc đấp số

THÔNG CẢM

-.(2/3.5+2/5.7+...+

-2/3.5+(-2/5.7)+(-2/7.9)+(-2/9.11)+.....+(-2/99.111)

a) 3³ - 10² : 5² + 2³ . 7 

= 27 - 5⁴ : 5² + 8.7

= 27 - 5² + 56

= 27 - 25 + 56

= 2 + 56

= 58

a) 79

b) 2

c) 990

d) = 80  - {140 - [868-12(64)]}

    = 80 - (140-100)

    = 80- 40

    = 40

mk ko bít bạn có cần trình bày ko nên mk vít kq hoi

( 1/15 + 1/35 + 1/63 ) * x = 1

1/9 * x = 1

x = 1 : 1/9

x = 9

Vậy x = 9

\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{65}\right)\times x=1\)

                                  \(\frac{1}{9}\times x=1\)

                                              \(x=1:\frac{1}{9}\)

                                              \(x=1\times9\)

                                              \(x=9\)

?????????????????????????????????

Vở bìa màu vàng ở trên và cam ở dưới

\(x-\frac{2}{3}-\frac{2}{15}-\frac{2}{35}-\frac{2}{63}=30\frac{1}{9}\)

\(x=31\)

\(30\frac{1}{9}\)= \(\frac{271}{9}\)

\(x-\frac{2}{3}-\frac{2}{15}-\frac{2}{35}-\frac{2}{63}=\frac{271}{9}\)

\(x=\frac{271}{9}-\left(\frac{2}{3}+\frac{2}{15}+\frac{2}{35}+\frac{2}{63}\right)\)

\(x=\frac{263}{9}\)

~ Chúc bạn học tốt ~

X - 2/3 - 2/15 - 2/35 - 2/63 = 30 1/9

X - 2/3 - 2/15 - 2/35 - 2/63 = 271/9

X= 271/9 + 2/63 + 2/35 + 2/15+ 2/3

X = 31

a, 48,63,80,99...
b, 288,399...
c,21,28,36,45,55,66,78,91...
d, 37,50,64,79,95...

A = \(\dfrac{2}{1\times3}\) + \(\dfrac{2}{3\times5}\) + \(\dfrac{2}{5\times7}\) + \(\dfrac{2}{7\times9}\)

A = \(\dfrac{1}{1}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}\) + \(\dfrac{1}{7}-\dfrac{1}{9}\)

A = \(\dfrac{1}{1}-\dfrac{1}{9}\)

A = \(\dfrac{8}{9}\)

B = \(\dfrac{1}{3}+\dfrac{1}{15}\) + \(\dfrac{1}{35}+\) \(\dfrac{1}{63}\) + ... + \(\dfrac{1}{195}\)

B = \(\dfrac{1}{1\times3}\) + \(\dfrac{1}{3\times5}\) + \(\dfrac{1}{5\times7}\) + ...+ \(\dfrac{1}{13\times15}\)

B = \(\dfrac{1}{2}\) x (\(\dfrac{2}{1\times3}\) + \(\dfrac{2}{3\times5}\) + \(\dfrac{2}{5\times7}\) + ..+ \(\dfrac{1}{13}\) - \(\dfrac{1}{15}\))

B = \(\dfrac{1}{2}\) x (\(\dfrac{1}{1}\) - \(\dfrac{1}{3}\) + \(\dfrac{1}{3}-\dfrac{1}{5}\) + ...+\(\dfrac{1}{13}-\dfrac{1}{15}\))

B = \(\dfrac{1}{2}\) x (\(\dfrac{1}{1}-\dfrac{1}{15}\))

B = \(\dfrac{1}{2}\) x \(\dfrac{14}{15}\)

B = \(\dfrac{7}{15}\)