Question

tính nhanh:   20x10+20x9+20x11+10x2+10x3+10x4+10x1

Answer 1

= 700 nha cái đồ giả mạo gái thành trai

Answer 2

=> 20 x ( 10 + 9 + 11 ) + 10 x ( 2 + 3 + 4 + 1 )

=> 20 x 30 + 10 x 10

=> 600 + 100

=> 700

Answer 3

 

20x10+20x9+20x11+10x2+10x3+10x4+10x1

=20x(10+9+11)+10x(2+3+4+1)

=20x30+10x10

=600+100

=700

 

Answer 4

   20 x 10 + 20 x 9 + 20 x 11 + 10 x 2 + 10 x 3 + 10 x 4 + 10 x 1

= 20 x (10 + 9 + 11) + 10 x (2 + 3 + 4 + 1)

= 20 x 30 + 10 x 10 

= 600 + 100

= 700