1 + 2 + ... + 9 + 10 x 0 + 1 + 2 + 4 + 3

= 45 + 0 +10

= 55

Chúc bạn học tốt !!!

Bài làm

   1 + 2 + 3 +  4 + 5 + 6 + 7 + 8 + 9 + 10 x 0 + 1 + 2 + 4 + 3 

=  1 + 2 + 3 +  4 + 5 + 6 + 7 + 8 + 9 + 0 + 1 + 2 + 4 + 3 

=  ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + ( 5 + 1 + 2 + 3 ) + 4 + 0

=      10      +     10     +     10      +      10     +          10            + 4

= 54

# Chúc bạn học tốt #

Trả lời...........

=10

Những số nhân với 0 thì bằng 0 nên số 0 ở thứ 11 rồi cộng thêm 4 số là song

....................học tốt................

a: =5/6(1/8+2/3)=5/6*19/24=95/144

b: =3/4(7/5-1/2)=27/40

c: =35/24*2/3=35/36

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

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

=10+10+10+10+10+5

=5x10+5

=50+5

=55

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

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

=   10      +   10      +    10   +   10   + 5

=  10 x 4 + 5 

= 40 + 5 

= 45

55 nha

k cho mik

=20^7+20^6+10^5+20^4+10^3+90^2+40+4

=1280000000+6400000+100000+16000+1000+8100+44

=1286400000+116000+9144

=1286516000+9144

=1286525144

Chuẩn ko cần phải chỉnh

Cko mik hỏi bn thy violympic có đúng k vậy? 

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

= 3 + 7 + 11 + 15 + 9

= 10 + 11 + 15 + 9

= 21 + 15 + 9

= 36 + 9

= 45

45 nha bạn 

tk mình nha

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45

\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)

\(=3-\frac{1}{4}+\frac{2}{3}-5-\frac{1}{3}+\frac{6}{5}-6+\frac{7}{4}-\frac{3}{2}\)

\(=\left(3-5-6\right)+\left(-\frac{1}{4}+\frac{7}{4}-\frac{3}{2}\right)+\left(\frac{2}{3}-\frac{1}{3}\right)+\frac{6}{5}\)

\(=-8+\frac{1}{3}+\frac{6}{5}\)

\(=-\frac{97}{15}\)

= 3 - 1/4 +2/3 - 5 - 1/3 + 6/5 - 6  + 7/4 - 3/2

= 2/3 . -3/2 . ( 3 + 5 + 6 ) . ( 2/3 + 1/3 ) . ( -1/4 - 7/4) 

= -1 . 14 . 1 . 6/4

= -14 . 1 . 6/4

= -14 . 6/4

= -84/4 = -21

\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)

\(=3+\frac{-1}{4}+\frac{2}{3}-5+\frac{-1}{3}+\frac{6}{5}-6+\frac{7}{4}+\frac{-3}{2}\)

\(=3+\frac{-1}{4}+\frac{2}{3}+-5+\frac{6}{5}+-\frac{1}{3}+-6+\frac{7}{4}+\frac{-3}{2}\)

\(=\left(3+-5+-6\right)+\left(-\frac{1}{4}+\frac{7}{4}\right)+\left(-\frac{1}{3}+\frac{2}{3}\right)+\frac{6}{5}+\frac{-3}{2}\)

\(=-8+\frac{3}{2}+\frac{1}{3}+\frac{6}{5}+\frac{-3}{2}\)

\(=\left(\frac{3}{2}+\frac{-3}{2}\right)+\left(\frac{6}{5}+\frac{1}{3}+-8\right)\)

\(=\frac{18}{15}+\frac{5}{15}+\frac{-120}{15}\)

\(=-\frac{97}{15}\)

Ta có: 5 - 3 = 2 ; 5+3 =8

=> 5+3 = 28

9-1 = 8 ; 9 +1 = 10

=> 9+1 = 810

..............

7 + 3 =

7-3 = 4 ; 7 +3 =10

=> 7 +3 = 410

Ta có : 5 - 3 = 2 ; 5 + 3 = 8 

=> 5 + 3 = 28

9 - 1 = 8 ; 9 + 1 = 10

=> 9 + 1 = 810

---------------------------

7 + 3 = ?

7 - 3 = 4 ; 7 +3 = 10

=> 7 + 3 = 410 

giúp mik zứi😭😭😭

a; 60 \(\times\) (\(\dfrac{7}{12}\) + \(\dfrac{4}{15}\)) 

 =  60 \(\times\) \(\dfrac{7}{12}\) + 60 \(\times\) \(\dfrac{4}{15}\)

= 35 + 16

= 51

b; \(\dfrac{1}{2}\) \(\times\)\(\dfrac{2}{3}\) \(\times\) \(\dfrac{3}{4}\) \(\times\) \(\dfrac{4}{5}\) \(\times\) \(\dfrac{5}{6}\) \(\times\) \(\dfrac{7}{8}\) \(\times\) \(\dfrac{8}{9}\)

= \(\dfrac{2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8}\) \(\times\) \(\dfrac{1}{9}\)

= 1 \(\times\) \(\dfrac{1}{9}\)

= \(\dfrac{1}{9}\)