110+220+330+440+560+670+780+890+500
= (110+890)+(220+780)+(330+670)+(440+560)+500
= 1000+1000+1000+1000+500
=4500
Tính bằng cách thuận tiện nhất
110+220+330+440+560+670+780+890+500
Trả lời :
( 110 + 890 ) ( 220 + 780 ) + ( 330 + 670 ) + ( 440 + 560 ) + 560 + 500 =
1000 + 1000 + 1000 + 1000 + 560 + 500 =
4000 + 1060 =
5060
^ HT ^
= (110+890)+(220+780)+(330+670)+(440+560)+500
= 1000 + 1000 + 1000 + 1000 + 500
= 4000 + 500
= 4500
HT
phuonglebao9@gmail.com
110+220+330+440+560+670+780+890+500
= ( 110 + 890 ) + ( 220 + 780 ) + ( 330 + 670 ) + ( 440 + 560 ) + 500
= 1000 + 1000 + 1000 + 1000 + 500
= 1000 x 4 + 500
= 4000 + 500
= 4500