Question

Tính nhanh 1,28×16,5+1,28×82,5+1,28

Answer 1

=1,28(16,5+82,5+1)=1,28x100=128

Answer 2

 1,28x16,5+1,28x82,5+1,28

=1,28x(16,5+82,5+1)

=1,28x100

128

Answer 3

 1,28x16,5+1,28x82,5+1,28

=1,28x(16,5+82,5+1)

=1,28x100

=128