Question

Tính nhanh

 1+8+3+9+7+2

Answer 1

1+8+3+9+7+2=

(1+9)+(2+8)+(3+7)=

10+10+10=

10x3=

30

Tích nha

Answer 2

 Ta co : 1+8+3+9+7+2

                     =[1+9]+[2+8]+[3+7]

                     =10+10+10

                     =30

   k mk nha 

Answer 3

=(1+7+2)+(8+3+9)

=10+20

=30

Answer 4

  1+8+3+9+7+2

=(1+9)+(8+2)+(3+7)

=  10   +  10   +  10

=30

Answer 5

9+3

12+9

21+7+2

=30

Answer 6

 1 + 8 + 3 + 9 + 7+ 2

= ( 1 + 9 ) + ( 8 + 2 ) + ( 7 + 3 )

= 10 + 10 + 10

= 10 x 3

= 30

Answer 7

1+8+3+9+7+2=

(1+9)+(2+8)+(3+7)=

10    +   10  +   10=

30

Answer 8

= (1+9)+(3+7)+(8+2)

=10     +  10  + 10

=10x 3=30

Answer 9

1 + 8 + 3 + 9 + 7 + 2 = 30

Answer 10

1 + 8 + 3 + 9 + 7 + 2

= ( 1 + 9 ) + ( 8 + 2 ) + ( 3 + 7 )

= 10         +     10      +     10

=  30 

Answer 11

1+8+9+3+7+2=(1+9)+(8+2)+(7+3)=30

Answer 12

30 bạn nhé

Answer 13

1 + 8 + 3 + 9 + 7 + 2

= ( 1 + 9 ) + ( 8 + 2 ) + ( 7 + 3 )

= 10 + 10 + 10 

= 10 x 3 

= 30