{2.5+2.5+2.5+2.5}乘25乘8
=2.5*4*25*8
=10*25*4*2
=10*100*2
=20009又4分之3减15除以19减19分之2乘2简算。帮帮忙，快哦39/4-15/19-2/19*2=39/4-(15/19+4/19)=39/4-1=35/4=8又4分之3看到了没有7.6乘1/2除以[1.9减1.9乘{1.9减1.9}]简算你先采纳吧，再问你说吧，反正我也要采纳，快啊7.6乘1/2除以[1.9减1.9乘{1.9减1.9}]=3.8/1.9=2