Question

Tính:

587-(-123)+(-69)-(123-587)

Answer 1

587-(-123)+(-69)-(123-587)

=-587+123-69-123+587

=-69

Answer 2

= 587 + 123 - 69 - 123 + 587

= (587 + 123) - (123 + 587) - 69

= -69