Question

tinh    :20+30+(-20)+(-30)+100          ;100+230+600+(-100)+(-230)

Answer 1

 20 + 30 + (-20) + (-30) = 100

100 + 230 + 600 + (-100) + (-230) = 600

Answer 2

  20+30+(-20)+(-30)+100

=[20+(-20)]+[30+(-30)]+100

=0+0+100

=100.

  100+230+600+(-100)+(-230)

=[100+(-100)]+[230+(-230)]+600

=0+0+600

=600.

Answer 3

20 + 30 +(- 20) + (-30 )+100=20 +(-20)+30 +(-30)+ 100=0 +0+100=100

100+230+600+(-100)+(-230)=100+(-100)+230+(-230)+600=0+0+600=600

Answer 4

A, 20 + 30 +(-20) +(-30) +100

=[(-20) + 20] +[(-30) +30] +100

=0 + 0 + 100

=100

B,100 +230 +600 +(-100) +(-230)

=[100+(-100)] +[230 +(-230)] +600

=0 + 0 +600

=600

HAPPY NEW YEAR 

TK NHA BẠN

Answer 5

20+30+(-20)+(-30)+100 

= [ 20 + ( -20 ) ] + [ 30 + ( -30 ) ] + 100

= 0 + 0 + 100

= 100

100 + 230 + 600 + ( -100 ) + ( -230 )

= [ 100 + ( -100 ) ] + [ 230 + ( -230 ) ] + 600

= 0 + 0 + 600

= 600