2459 - (400 + 459)
= 2459 - 400 - 459
= (2459 - 459) - 400
= 2400 - 400
= 2000
=2459-400-459
=(2459-459)-400
=2000-400
=1600
a) 2459 - (400 + 459)2459 - (400 + 459)
= 2459 - 859= 2459 - 859
= 1600
(bn tự ghi đề nha)
=2459-400-459
=(2459-459)-400
=2000-400
=1600
2459 - 400 - 459
= ( 2459 - 459 ) - 400
= 2000 - 400
= 1600