2/5×(4-2/3)÷8/15
=2/5 ×(4-2/3)×(15/8)
=(2/5)×(15/8)×(4-2/3)
=(3/4)×(4-2/3)
=(3/4)×4 - (3/4)×(2/3)
=3 - 1/2
=2又1/2
2/5×(4-2/3)÷8/15
=2/5*15/8*4-2/5*15/8*2/3
=3/4*4-3/4*2/3
=3- 1/2
=5/2.
2/5×(4-2/3)÷8/15
=2/5×(10/3)×15/8
=3/4×10/3
=5/2
2/5*(4-2/3)*8/15=3/4*4-2/3*3/4=3-1/2=5/2