Question

Tính:

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

B=10+20+30+40+50+50+60+70+80+90+100

 

Answer 1

Tính :

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

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

A =     10    +    10    +    10    +   10   +    10    +      10

A =  60

B = 10 + 20 + 30 + 40 + 50 + 50 + 60 + 70 + 80 + 90 + 100

B = ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + ( 50 + 50 ) + 100

B =       100     +      100      +      100     +      100       +      100      +      100

B =  600

Answer 2

A=56

B=600

Answer 3

A = ( 1 + 10 ) x 10 : 2 = 55

B = ( 10 + 100 ) x 11 : 2 = 605 

Answer 4

A=55 , B=550

Answer 5

A) 55 b ) 550 nhé

Answer 6

A=55

B=550

K NHA!

ĐÚNG 100%

Answer 7

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

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

A =      10 + 10 + 10 + 10 + 15

A = 55

B = 10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90 + 100

B = ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + ( 50 + 100 )

B = 100 + 100 + 100 + 100 + 150

B = 550