Question

tính nhanh : 5,6x2 +2,8x8 +11,2x2 - 48,5

Answer 1

5,6x2 +2,8x8 +11,2x2 - 48,5

=5,6*2+9,6*2+11,2*2-24,25*2

=2*(5,6+9,6+11,2-24,25)

=2*2,15

=4,3

Answer 2

5,6x2 +2,8x8 +11,2x2 - 48,5
=5,6*2+9,6*2+11,2*2-24,25*2
=2*(5,6+9,6+11,2-24,25)
=2*2,15
=4,3