Question

Tính bằng cách thuận tiện nhất

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

Answer 1

 10+20+30+40+50+60+70+80+90

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

=100 + 100 + 100 + 100 + 50

= 100 x 5 + 50

= 500 + 50 =550

Answer 2

= ( 1 0 + 90) + ( 20 + 80)  + ( 30 + 70) + ( 40 + 6 0) + 50

= 100 + 100 + 100 + 100 + 50

= 400 + 50 

= 450

Answer 3

Vì nguyễn trung hiếu xin **** của Đỗ Tiến

Answer 4

10+20+30+40+50+60+70+80+90=(10+90)+(20+80)+(30+70)+(40+60)+50=100+100+100+100+50=(100+100+100+100)+50=400+50=450

Answer 5

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

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

=100+100+100+100+50

=200+200+50

=400+50
=450

Answer 6

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

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

=  100 + 100 + 100 + 100 +50 

=  100 x 4  + 50 

=  400 + 50 

= 450

Answer 7

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

100      + 100     + 100    + 100     + 50 =450

Answer 8

10+20+30+40+50+60+70+80+90=4500 nhé

Answer 9

10+20+30+40+50+60+70+80+90=450

Answer 10

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

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

=100+100+100+100+50

=400+50

=\(450knha\)

Answer 11

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

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

= 100 + 100 + 100 + 100 + 50

= 100 x 4 + 50

= 400 + 50

= 450

Answer 12

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

(100+100+100+100) +50

100*4+50

400+50

=450

ai k mk mk k lại gấp 3 , 4 lần 

mk hổng có lừa đâu

Answer 13

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

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

=  100 + 100 + 100 + 100 + 50

=  450

K CHO MÌNH NHÉ VÌ MÌNH CHƯA CÓ ĐIỂM HỎI ĐÁP NÀO CẢ

Answer 14

10+20+30+40+50+60+70+80+90
=(10+90)+(20+80)+(30+70)+(40+60)+50
=100+100+100+100+50
=200+100+100+50
=300+100+50
=400+50
=450

Answer 15

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

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

= 100 + 100 + 100 + 100 + 50

= 400 + 50

= 450

Answer 16

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

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

=100+100+100+100+50

=450

Answer 17

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

100+100+100+100+50

400+50

450

Answer 18

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

\(=\left(10+90\right)+\left(20+80\right)+\left(30+70\right)+\left(40+60\right)+50\)

\(=100+100+100+100+50\)

\(=100.5+50\)

\(=550\)

*Lưu ý : Dấu " . " là dấu nhân

Answer 19

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

=100+100+100+100+50

=200+100+100+50

=300+100+50

=400+50

=450

Answer 20

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

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

=100+100+100+100+50

=400+50

=450

Answer 21

10+20+30+40+50+60+70+80+90= 550

Answer 22

rat la te

Answer 23

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

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

= 100+100+100+100+50

= 400+50

= 450

Answer 24

(90+10)*9/2 =450 nha bạn

Answer 25

 10+20+30+40+50+60+70+80+90

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

=100+100+100+100+50

=400+50

=450

Answer 26

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

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

= 100 + 100 + 100 + 100 + 50 

= 450 

Học tốt   ^ _ ^ 

k và kb nếu có thể 

Answer 27

(10+90)+(20+80)+(30+70)+(40+60)+50=450

Answer 28

10+20+30+40+50+60+70+80+90
=(10+ 90)+(20+80)+(30+70)+(40+60)+50
=100+100+100+100+50
=450

Answer 29

450nha

Answer 30

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

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

= 100 + 100 + 100 + 100 + 50 

= 450