10+20+30+40+50+60+70+80+90+100=(10+100)+(20+90)+(30+80)+(40+70)+(50+60)
=110+110+110+110+110
=110x5
=550
= ( 10 + 100 ) + ( 20 + 90 ) + ( 30 + 80 ) + ( 40 + 70 ) + ( 50 + 60 )
= ( 10 + 100 ) x 5
= 110 x 5
= 550
=(10+100) + (20+80) + (30+70) + (40+60) + (50+50)
=(10+100)x5=550
= ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + ( 50 + 100 )
= 100 + 100 + 100 + 100 + 150
= 100 x 4 + 150
= 400 + 150
= 550
Dễ òm : (10+90) + (20+80) + (30+70) = (40+60) + (50+100)
= 100 + 100 + 100 + 100 + 150
= 400 + 150
= 550
10 + 20 +30 +40 +50 + 60 +70 + 80 +80 +90 +100 = 2970
Ủng hộ cho mình nha ! ^ ^
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90 + 100 = 550
duyệt nha
= (10+100) + (20+90) + (30+80) + (40+70) + (50+60)
= 110 + 110 + 110 +110 + 110
= 110 . 5
=550