Question

tính nhanh : 10 + 11 + 12 + 13 + 14 + 15 + 16 + 1 7 + 18 + 19 + 20

Answer 1

=(10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) +15

= 30 + 30 + 30 + 30 + 30 + 15

=165

Answer 2

10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20

= (10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15

= 30 + 30 + 30 + 30 + 30 + 15

= 30 x 5 + 15

= 150 + 15

= 165

k cho mk nha bn !

Answer 3

10 + 11 + 12 + 13 + 14 + 15 + 16 + 1 7 + 18 + 19 + 20

=(10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15

= 30 x 5 + 5

= 150 + 5

= 155

Answer 4

10 + 11 + 12 + 13 + 14 + 15 + 16 + 1 7 + 18 + 19 + 20

= ( 10 + 20 ) + ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 ) + ( 14 + 16 ) + 15

= 30 + 30 + 30 + 30 + 30 + 15

= 30 x 5 + 15

= 150 + 15

= 165

Answer 5

10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20

= ( 10 +20 ) + ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 ) + ( 14 + 16 ) + 15

= 30 + 30 + 30 + 30 + 30 + 15

= 30 x 5 + 15

= 150 + 15

= 165

Answer 6

10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20

= ( 10 + 20 ) + ( 11 + 19 ) +......+ ( 14 + 16 )  + 15

= 30 + 30 + 30 + 30 + 30 + 15

= 30 x 5 + 15

= 165

Answer 7

165 là đáp án của mik

Answer 8

=> ( 10 + 20 ) x 5 + 15
=> 30 x 5 + 15
=> 150 + 15
=> 165

Answer 9

165 là đúng

Answer 10

kết quả 165

Answer 11

10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20

= (10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15

=(30+30+30+30+30)+15

=30x5+15

=150+15

=165