Question

Ai đúng mk tk nha: Tính nhanh:

1+4+7+10+13+16+19=???

Answer 1

1+4+7+10+13+16+19=(1+19)+(4+16)+(7+13)+10=20.3+10=70

Answer 2

=40 nha

Answer 3

 = (1+19)+(4+16)+(7+13)+10

 = 20+20+20+10 =  70

k mk nha

Answer 4

1 + 4 + 7 + 10 + 13 + 16 + 19

= ( 1 + 19 ) + ( 4 + 16 ) + ( 7 + 13 ) + 10

= 20 + 20 + 20 + 10

= 20 x 3 + 10

= 60 + 10

= 70 

Answer 5

1+4+7+10+13+16+19

=(1+19)+(4+16)+(7+13)+10

=20+20+20+10

=70

Answer 6

1+4+7+10+13+16+19

=(1+19)+(4+16)+(7+13)+10

=20+20+20+10

=70

K CHO MÌNH NHA!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 7

=(1+19)+(4+16)+(7+13)+10

=20+20+20+10

=70

chúc bạn học tốt

Answer 8

1+4+7+10+13+16+19

=(1+19)+(4+16)+(7+13)+10

=20+20+20+10

=70

Answer 9

1+4+7+10+13+16+19=89