67*四分之一+2又二分之一*3.75减四又二分之一*25%
=(67*1/4-4又1/2*1/4)+2又1/2*3又3/4
=62又1/2*1/4+37又1/2*1/4
=(62又1/2+37又1/2)*1/4
=100*1/4
=25
0.8888*0.6+0.2222*7.6
=0.2222*4*0.6+0.2222*7.6
=0.2222*(2.4+7.6)
=2.222
465*8.2+46.5*296减365*37.8
=465*8.2+465*29.6-365*37.8
=465*(8.2+29.6)-365*37.8
=465*37.8-365*37.8
=(465-365)*37.8
=3780