Question

10+20+30+40+50+60+70+80+90+100=?

Answer 1

= 10 x ( 1 + 2 + 3 + 5 + 6 + 7 + 8 + 9 + 10)

= 10 x 45

= 450 

Answer 2

10+20+30+40+50+60+70+80+90+100

=(100+10)+(90+20)+(80+30)+(70+40)+(60+50)

=110+110+110+110+110

=110x5=550

Đúng 100% đấy !

Answer 3

=10x(1+2+3+4+5+6+7+8+9+10)

=10x45

=450

Đúng 100% đấy! Vừa nãy là em mình làm  nên cho mình sorry!

Answer 4

10+20+30+40+50+60+70+80+90+100=(10+90)+(20+80)+(30+70)+(40+60)+50+100=100+100+100+100+50+100=(100+100+100+100+100)+50=500+50=550

Answer 5

10+20+30+40+50+60+70+80+90+100

=(10+90)+(20+80)+(30+70)+(40+60)+50+100

=100+100+100+100+100+50

=500+50

=550

Answer 6

10+20+30+40+50+60+70+80+90+100

[10+90]+[20+80]+[30+70]+[40+60]+50+100

   100   +  100    +   100   +   100  + 50 +100

                        550