1+1=2

mình nhanh nhất k cho mk nha

2

kick mk nha

Số các số hạng là:

( 20 - 1 ) :1 + 1 = 20

Tổng dãy số trên là:

( 1 + 20) x 20 : 2= 210

Bài này có nhiều cách giải nhưng cach này nhanh hơn !

1 + 2 + 3 + ... + 19 + 20 = 210 

k mình nhé !

= 20

k mk mk k lại

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10+10=20

500x2=1000

500*2=1000

k tớ nhé

tớ ở đây

cảm ơn nhiều

k nha

225630 nha bạn

230 x 981 = 225 630.

20*3=60

tk mình nha

20*3=60

k nha

mình nè

kb nữa

cảm ơn nhiều

=14

k nha

cảm ơn bạn

thanks nhiều

7+7=14

k mk k lại

3-1 =4-2=1+1

3 - 1 = 2

Đáp số : 2

tk mình nha 

kb luôn nha

thanks. chúc học tốt

50*2=100

50*2=100 nhé

k nè,mình ở đây

k nha

và kb nữa

mik có