Question

1+1+2+2+3+3+...+10+10=?

Answer 1

1+1++2+2+3+3+...+10+10=110

Answer 2

=1x2+2x2+3x2+4x2+5x2+6x2+7x2+8x2+9x2+10x2

=2+4+6+8+10+12+14+16+18+20

=(2+18)=(4+16)+(6+14)+(8+12)+20

=20+20+20+20+20

=20x4=80

Nhớ k cho mình nha

Answer 3

= 1.2 + 2.2 + 3.2 + .....+ 10.2

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

= 55 . 2

= 110

Answer 4

= 1 x 2 + 2 x 2 + 3 x 3 + ...+ 10 x 2

= 2 x ( 1 + 2 + 3 + ....+ 10 )

= 2 x [ ( 10 - 1 ) : 1 + 1 ]

= 2 x [ 9 : 1 + 1 ]

= 2 x [ 8 + 1 ]

= 2 x 9

=  18

nhớ tk cho mk nhé

Answer 5

1+1+2+2+3+3+....+10+10

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

=2+4+6+8+10+12+14+16+18+20

=(2+18)+(4+16)+(6+14)+(8+12)+10+20

=20+20+20+20+30

=110

k mik nha

Answer 6

ban oi luc dau minh thay cai de no hoi ki ki ngung h thi moi thay hay

dap an la 110

k nhe ban cam on