Question

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70

Answer 1

1 + 9 + 2 + 8 + 30 + 40 + 90 + 700 = 890

Answer 2

\(1+9+2+8+30+40+90+70=250\)

Answer 3

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70
= ( 1 + 9 ) + ( 2 + 8 ) + ( 30 + 70 ) + ( 90 + 40 )
= 10 + 10 + 100 + 130
= 100 + ( 130 + 10 . 2 )
= 100 + 130 + 20
= 100 + 150
= 250

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70
= ( 1 + 9 ) + ( 2 + 8 ) + ( 30 + 70 ) + ( 90 + 40 )
= 10 + 10 + 100 + 130
= 100 + ( 130 + 10 . 2 )
= 100 + 130 + 20
= 100 + 150
= 250

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70
= ( 1 + 9 ) + ( 2 + 8 ) + ( 30 + 70 ) + ( 90 + 40 )
= 10 + 10 + 100 + 130
= 100 + ( 130 + 10 . 2 )
= 100 + 130 + 20
= 100 + 150
= 250

Answer 4

 1 + 9 + 2 + 8 + 30 + 40 + 90 + 70 

= 10 + 10 + 30 + 40 + 90 + 70 

= ( 10 + 90 ) + ( 10 + 40 ) + ( 30 + 70 )

= 100 + 50 + 100

= 250

ai k mình , mình k lại

Answer 5

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70 

= 10 + 10 + 30 + 40 + 90 + 70

= ( 10 + 90 ) + ( 10 + 40 ) + ( 30 + 70 )

= 100 + 50 + 100

= 250

Answer 6

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70 

= 10 + 10 + 30 + 40 + 90 + 70 

= ( 10 + 90 ) + ( 10 + 40 ) + ( 30 + 70 )

= 100 + 50 + 100

= 250

Answer 7

1 + 9 + 2 + 8 + 30 + 40 + 90 + 70

= ( 1 + 9 ) + ( 2 + 8 ) + ( 30 + 70 ) + ( 90 + 40 )

= 10 + 10 + 100 + 130

= 250