= 0 nha em

bằng 0

nhìn th

Kết quả bằng -5 nha!

1+1-2-2-3-4-5-6-7-8-9+1+3+5+7+9+10

=-44+1+3+5+7+9+10

=-44+35

=-9

-5 nha bạn

Lời giải:
a. 

$\frac{7}{4}+\frac{5}{-6}+\frac{21}{8}=\frac{42}{24}+\frac{-20}{24}+\frac{63}{24}=\frac{85}{24}$

b.

$\frac{4}{9}+\frac{-7}{12}+\frac{8}{15}$

$=\frac{80}{180}+\frac{-105}{180}+\frac{96}{180}=\frac{71}{180}$

c.

$=\frac{-1}{3}+\frac{5}{6}+\frac{19}{12}+2$
$=\frac{-4}{12}+\frac{10}{12}+\frac{19}{12}+2=\frac{25}{12}+2=\frac{49}{12}$

bạn ơi , tính đầy đủ cho mình với

địt con mẹ mày lên

\(\dfrac{1}{3}\)-\(\dfrac{2}{15}\)+\(\dfrac{14}{15}\)=\(\dfrac{3}{15}\)-\(\dfrac{2}{15}\)+\(\dfrac{14}{15}\)

=\(\dfrac{13}{15}\)

\(\dfrac{3}{5}\)+4-\(\dfrac{6}{7}\)=\(\dfrac{3}{5}\)+\(\dfrac{20}{5}\)-\(\dfrac{6}{7}\)=\(\dfrac{23}{5}\)-\(\dfrac{6}{7}\)=\(\dfrac{161}{35}\)-\(\dfrac{30}{35}\)=\(\dfrac{131}{35}\)

=1/1x2 + 1/2x3 + 1/3x4 +1/4x5+ 1/5x6 + 1/6x7 + 1/7x8 + 1/8x9 + 1/9x10

=1/1 -1/2 +1/2 -1/3 +1/3 -1/4+1/4-1/5+ 1/5 -1/6 + 1/6-1/7 + 1/7-1/8 + 1/8- 1/9 + 1/9- 1/10

=1/1 -1/10

=9/10

bằng 131/840=0,155952381

a= -1/7

b -50/21

c   1/8

d 19/56

e-13/24

f -89/312

55 

tich nha Lê trọng thạch

1 + 2 + 3 + 4+  5 + 6 + 7 +8 + 9 + 10

= 10 x 11 : 2

= 110 : 2 = 55

Đáp số: 55

ap dung cong thuc la ra ngay!55

\(\frac{2}{7}+\frac{5}{7}=\frac{7}{7}=1\)

\(\frac{8}{15}+\frac{6}{15}=\frac{14}{15}\)

\(\frac{2}{3}+\frac{3}{9}+\frac{4}{9}=\frac{6}{9}+\frac{3}{9}+\frac{4}{9}=\frac{9}{9}+\frac{4}{9}=\frac{13}{9}\)

1,14/15,13/9,

2/7 + 5/7 = 7/7 = 1

8/15 + 6/15 = 14/15

2/3 + 3/9 + 4/9 = 6/9 + 3/9 + 4/9 = 13/9

duyet minh rui minh ket

(1+9)+(2+8)+(3+7)+(4+6)+5

10+10+10+10+5=45

Ta có: (1+9)+(2+8)+(3+7)+(4+6)+5=45

 k mình nhé để mình tự tin hơn nhé

Cảm ơn các bạn rất nhiều

1+2+3+4+5+6+7+8+9++10=55

55 nha

bằng 61 nheeeee