Question

100 + 200 +300 + 400 + 500 + 600 +700 + 800 + 900 = ?

tính bằng cách thuận tiện nhất

Answer 1

100+200+300+400+500+600+700+800+900

=(100+900)+(200+800)+(300+700)+(400+600)+500

=1000+1000+1000+1000+500

=4500

Answer 2

100 + 200 +300 + 400 + 500 + 600 +700 + 800 + 900 

=100 x ( 1 + 2 + 3 + 4 +5 + 6 + 7 + 8 + 9 )

=100 x 45

=4500

Answer 3

100 + 200 + 300 + 400 + 500 + 600 + 700 + 800 + 900

=(100 + 900 ) + (200 + 800 ) + (300 + 700) + (400 + 600) + 500

=1000 + 1000 + 1000 + 1000 + 500

=4500

Answer 4

\(100+200+300+400+....+900\)

\(=\left(100+900\right)+\left(200+800\right)+\left(300+700\right)+\left(400+600\right)+500\)

\(=100+100+100+100+500\)

\(=100\cdot4+500\)

\(=400+500\)

\(=900\)

Answer 5

100 + 200 + 300 + 400 + 500 + 600 + 700 + 800 + 900 = 4500

ai k mình , mình k lại

Answer 6

100+900+200+800+300+700+600+400+500=4500

Answer 7

(100+900)+(200+800)+(300+700)+(400+600)+500

=1000+1000+1000+1000+500

=4500

Answer 8

\(100+200+300+400+500+600+700+900.\)

\(=\left(100+900\right)+\left(200+800\right)+\left(300+700\right)+\left(400+600\right)+500\)

\(=1000+1000+1000+1000+500\)

\(=1000.4+500\)

\(=4000+500\)

\(=4500\)

Answer 9

    100 + 200 + 300 + 400 + 500 + 600 + 700 + 800 + 900=

=(100 + 900) + (200 + 800) + (300 + 700) + (400 + 600) + 500

=     1000      +      1000     +       1000     +      1000     + 500

=                       1000 x 4 + 500 

=                          4000 + 500

=                             4500

nhé

Answer 10

=4500

tíck mik nha, mik sẽ tíck lại cho

Answer 11

= 4500 nha

Answer 12

\(100+200+300+400+500+600+700+800+900\)

\(=\left(100+900\right)+\left(200+800\right)+\left(300+700\right)+\left(400+600\right)+500\)

\(=1000+1000+1000+1000+500\)

\(=4500\)

Answer 13

=4500 nha bạn

k nha

Answer 14

4500 nhé bn

Answer 15

=(900+100)x9 :2 

=9000 :2

=4500

=4500 /

Answer 16

100 + 200 + 300 + 400 + 500 + 600 + 700 + 800 + 900

= 100 + ( 100 x 2 ) + ( 100 x 3 ) + ( 100 x 4 ) + ( 100 x 5 ) + ( 100 x 6 ) + ( 100 x 7 ) + ( 100 x 8 ) + ( 100 x 9 )

= 100 x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 )

= 100 x 45

= 4500

Answer 17

(100+900)+( 200+800)+(300+700)+(400+600)+500

=1000+1000+1000+1000+500

=4500

Answer 18

100+200+300+400+500+600+700+800+900

=(1.100)+(2.100)+(3.100)+(4.100)+(5.100)+(6.100)+(7.100)+(8.100)+(9.100)

=100.(1+2+3+4+5+6+7+8+9)

=100.45

=4500

Answer 19

4500nha con cach lam la <900+100.+<800+200>+<700=300>+<600+400>+500=4500

Answer 20

100+200+300+400+500+600+700+800+900

=(100+900)+(200+800)+(300+700)+(400+600)+500

=1000+1000+1000+1000+500

=4000+500

=4500

Answer 21

  = 4500

Answer 22

4500 ok

Answer 23

bang 4500

Answer 24

100 + 200 + 300+400 + 500 + 600 + 700 + 800 + 900 = 4500

Answer 25

bằng 4500

Answer 26

154636364540-565677880-163680+560000+(5254640)=

Answer 27

100 + 200 +300 + 400 + 500 + 600 +700 + 800 + 900 

= ( 100 + 900 ) + ( 200 + 800 ) + ( 300 + 700 ) + ( 400 + 600 ) + 500

= 1000 + 1000 + 1000 + 1000 + 500

= 4000 + 500

= 4500

Answer 28

100+200+300+400+500+600+700+800+900

=(100+900)+(200+800)+(300+700)+(400+600)+500

=1000x4+500

=4500

Answer 29

100 + 200 +300 + 400 + 500 + 600 +700 + 800 + 900 

=(100 + 900)+(200+800)+(700+300)+(400+600) +500

=1000.4 + 500

=4500

Chúc bạn học tốt !

 

Answer 30

100 + 200 +300 + 400 + 500 + 600 +700 + 800 + 900 

=(100 + 900)+(200+800)+(700+300)+(400+600) +500

=1000.4 + 500

=4500

học tốt !