Question

bài 1: tính các tổng sau 

a, 600 - ( - 200) - 220 -80

b, - ( - 127 ) +  ( - 117) - 303 -7

c, 777 - ( - 111 ) - ( - 333) -21

Answer 1

bài 1: tính các tổng sau 

a, 600 - ( - 200) - 220 - 80

= 600 + 200 - 220 - 80

= 500

b, - ( - 127 ) +  ( - 117) - 303 -7

= 127 - 117 - 303 - 7

= - 300

c, 777 - ( - 111 ) - ( - 333) -21

= 777 + 111 + 333 - 21

= 1200

Answer 2

\(a,600-\left(-200\right)-220-80\\ =\left(600+200\right)-\left(220+80\right)\\ =800-300\\ =500\\ b,-\left(-127\right)+\left(-117\right)-303-7\\ =127-117-303-7\\ =\left(127-117\right)-\left(303+7\right)\\ =10-310=-300\\ c,777-\left(-111\right)-\left(-333\right)-21\\ =777+111+333-21\\ =\left(777+333\right)+\left(111-21\right)\\ =1110+90\\ =1200\)