1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55
1+2+3+4+5+6+7+8+9+10=
(1+2+3+4)+(5+7+8)+(6+9+10)=
10+20+25=55
=( 1+9) +(2+8) +(3+7) +(4+6) +(5+10)
=10+10+10+10+5
=10x4+15
=40+15
=55
1*2*3*4*5*6*7*8*9*10=55
nho la dau sao la dau cong day
1*2*3*4*5*6*7*8*9*10=55
dẫu sao là dấu cộng đấy
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 =
( 1 + 2 + 3 + 4 ) + ( 5+7+8 ) + ( 6 + 9 + 10 ) =
10 + 20 + 25 = 55
1+2+3+4+5+6+7+8+9+10=
(1+2+3+4)+(5+7+8)+(6+9+10)=
10+20+25=55
1 + 2 + 3 +4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 DUYỆT ĐI !