1+4+7+10+13+16+19=(1+19)+(4+16)+(7+13)+10=20.3+10=70
= (1+19)+(4+16)+(7+13)+10
= 20+20+20+10 = 70
k mk nha
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
1+4+7+10+13+16+19
=(1+19)+(4+16)+(7+13)+10
=20+20+20+10
=70
1+4+7+10+13+16+19
=(1+19)+(4+16)+(7+13)+10
=20+20+20+10
=70
K CHO MÌNH NHA!!!!!!!!!!!!!!!!!!!!!!!!!!!
=(1+19)+(4+16)+(7+13)+10
=20+20+20+10
=70
chúc bạn học tốt
1+4+7+10+13+16+19
=(1+19)+(4+16)+(7+13)+10
=20+20+20+10
=70