Question

1+1+3+3+5+5+7+7+9+9

nhanh gọn ko dài dòng

Answer 1

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 + 9 

= 2 . 1 + 2 . 3 + 2 . 5 + 2. 7 + 2 . 9

= 2. ( 1 + 3 + 5 + 7 + 9 ) 

= 2 . 25

= 50 

Answer 2

50

k minh nha ban

Answer 3

=50

hok tốt 

Answer 4

=1x2+3x2+5x2+7x2+9x2

=2+6+10+14+18

=50

k nha thank

Answer 5

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 + 9

= ( 1 + 9 ) + ( 1 + 9 ) + ( 3 + 7 ) + ( 3 + 7 ) + ( 5 + 5 ) 

= 10 + 10 + 10 + 10 + 10

= 10 x 5 

= 50 

k mình nha !

Answer 6

\(1+1+3+3+5+5+7+7+9+9\)

\(=1\cdot2+3\cdot2+5\cdot2+7\cdot2+9\cdot2\)

\(=2\cdot\left(1+3+5+7+9\right)\)

\(=50\)

Chúc hok tốt

Answer 7

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 + 9

= (1 + 9) + (1 + 9) + (3 + 7) + (3 + 7) + (5 + 5)

=    10    +     10    +     10    +    10    +    10

 = 20 + 20 + 10

= 40 + 10

= 50

Answer 8

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 +  9

= ( 1 + 9 ) + ( 1 + 9 ) + ( 3 + 7 ) + ( 3 + 7 ) + ( 5 + 5 )

= 10 + 10 + 10 + 10 + 10

= 10 x 5

= 50

Answer 9

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 + 9

= 1 x 2 + 3 x 2 + 5 x 2 + 7 x 2 + 9 x 2

= 2 + 6 + 10 + 14 + 18

= 8 + 10 + 14 + 18

= 18 + 14 + 18

= 32 + 18

= 50

Answer 10

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 + 9

= ( 1 + 9 ) + ( 1 + 9 ) + ( 3 + 7 ) + ( 3 + 7 ) + ( 5 + 5 )

= 10 + 10 + 10 + 10 + 10

=10 x 5

= 50

Answer 11

1 + 1 + 3 + 3 + 5 + 5 + 7 + 7 + 9 + 9

 = ( 1 + 9 ) + ( 1 + 9 ) + ( 3 + 7 ) + ( 3 + 7 ) + ( 5 + 5 )  

= 10 + 10 + 10 + 10 + 10 

 = 50