77 + 123 + 672 + 581
= 200 + 672 + 581
= 872 + 581
= 1453
77+123+672+581
=200+672+581
=872+581
=1453
=1453
K mk nha làm ơnnnnnn
77+123+672+581
=200+672+581
=872+581
=1453
77+123+672+581
=200+672+581
=872+581
=1453
77+123+672+581=200+672+581
=872+581
=1453.
77+123+672+581
=200+672+581
=872+581
=1463