Question

Tính nhanh:

a)(-125)-ơ(-125)+225+75].                             b)2003-4006+6009

Answer 1

B).2003-4006+6009

=(2003+4006)-6009+6009

= 6009-6009+6009

=6009

Answer 2

a) ( - 125 ) - [ ( - 125 ) + 225 + 75 ]

= - 125 + 125 - 225 - 75

= ( 125 - 125 ) - ( 255 + 75 )

= 0 - 300

= - 300

b) 2003 - 4006 + 6009

= 6009 + 6009

= 6009 x 2 = 12 018

Answer 3

ý nhầm, câu b mk lm sai nha

b) 2003 - 4006 + 6009

= - 2003 + 6009

= 4006