Question

2+7+5+4+5+7=

Answer 1

=5x2+7x2+2+4

=10+14+2+4

=10+4+14+2

=14+14+2

=14x2+2

=28+2

=30

Answer 2

=30 chị nhé

Answer 3

=30

Answer 4

5x2+7x2+2+4

=10+14+2+4

=10+4+14+2

=14+14+2

=14x2+2

=28+2

=30

Answer 5

= 30

 

Answer 6

2 + 7 + 5 + 4 + 5 + 7 = 30

Answer 7

=5x2+7x2+2+4

=10+14+2+4

=10+4+14+2

=14+14+2

=14x2+2

=28+2

=30

Answer 8

30

 

Answer 9

=30

Answer 10

30

Answer 11

Ba chục

Answer 12

30

Answer 13

30

Answer 14

=30