Question

Tính nhanh:

a) 50+50+50+50+50+50+50+50+50+50+50+50=?

b) 100+100+100+100+100+100+100+100+100=?

Answer 1

a.50+...+50=50x12=600

b.100+..+100=100x9=900

Answer 2

a) 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 = 50 x 12

                                                                                       = 600

b) 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 = 100 x 9 

                                                                                    900

Answer 3

a ) 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50

= 50 x 12

= 600

b ) 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100

= 100 x 9

= 900

Answer 4

a) = 50 x 12 = 600

b) = 100 x 9 =   900

~ Đúng thì mk nha~

Answer 5

a) 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 = 50 x 12 = 600 .

b) 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 = 100 x 9 = 900 .

Answer 6

a) 50+50+50+50+50+50+50+50+50+50+50+50

= 50x12

= 600

b) 100+100+100+100+100+100+100+100+100

= 100x9

= 900

Answer 7

a) có 12 số 50 nên sẽ lấy 50   12 = 600

b) có 9 chữ số 100 nên sẽ lấy 100   9 =  900

Answer 8

a,50+50+50+50+50+50+50+50+50+50+50+50

=(50+50)+(50+50)+(50+50)+(50+50)+(50+50)+(50+50)

=100+100+100+100+100+100

=100x6

=600

b,100+100+100+100+100+100+100+100+100+100+100+100

=(100+100)+(100+100)+(100+100)+(100+100)+(100+100)+(100+100)

=200+200+200+200+200+200

=200x6

=1200

Answer 9

a , 50 nhân 12 = 600.

b, 100 nhân 9 = 900 .

mk ko ghi lại đề nhé 

k mk đi mk kb

Answer 10

A 600

B 900

Answer 11

a) 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50

=  50 x 12 = 600

b) 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100

= 100 x 9 = 900

Chúc bn hok tốt nhé!!! ^-^

Answer 12

a)600

b)900

Answer 13

a) 600

b) 1200

Answer 14

jclvzvkczvzvz

Answer 15

a:600

b:900

Answer 16

600

900