30 + 70 + 20 + 80 + 100 + 50 + 50 + 40 + 60
= 100 + 100 + 100 + 100 + 100
= 100 x 5
= 500
đ/s : 500
30 + 70 + 20 + 80 + 100 + 50 + 50 + 40 + 60
= (30 + 70) + (20 + 80) + (50 + 50) + (40 + 60) + 100
= 100 + 100 + 100 + 100 +100
= 100 . 5
= 500
ai k mk mk k lại
Ok!
30+70+20+80+100+50+50+40+60 =(30+70)+(20+80)+(50+50)+(40+60)+100 =100+100+100+100+100 =200+200+100 =400+100 =500
30 + 70 + 20 + 80 + 100 + 50 + 50 + 40 + 60
= ( 30 + 70 ) + ( 20 + 80 ) + (50 + 50 ) + ( 40 + 60 ) + 100
= 100 + 100 + 100 + 100 + 100
=500
30+70+20+80+100+50+50+40+60=500 nha bạn