精选优质文档-倾情为你奉上1000道四年级数学简便计算3001258=300（1258）=3001000=0.3396-96-172-28 =（396-96）-（172+28）= 300-200 = 100 125*24 = 125*8*3 = 1000*3 = 300026*15 = （20+6）*15 = 20*15 + 6*15 = 300+90 =39025*99*4 = 25*4*99 = 100*99 = 9900250*32 = 250*4*8 = 1000*8 = 8000（98+98+98+98）*25 = 4*98*25 = 4*25*98 = 100*98 = 9800472*5*20 = 472*（5*20）= 472*100 = 47200125*（8+800）= 125*8+125*800 = 1000 + = 129*38+38*872-38 = 38*（129+872-1）=38*1000=3800018*8*125*5 = 18*5*（125*8）=90*1000 = 90001384-(450+384
