67*1/4+2又1/2*3.75-4又1/2*25%

67*1/4+2又1/2*3.75-4又1/2*25%
67*1/4+2又1/2*3.75-4又1/2*25%

67*1/4+2又1/2*3.75-4又1/2*25%
67*1/4+2又1/2*3.75-4又1/2*25%
=67x1/4+5/2x15/4-9/2x1/4
=67x1/4+75/2x1/4-9/2x1/4
=1/4x(67+75/2-9/2)
=1/4x(67+33)
=1/4x100
=25

67*1/4+2又1/2*3.75-4又1/2*25%
=67*1/4+0.25*37.5-4又1/2*25%
=（67+37.5-4又1/2）*0.25
=100*0.25
=25