300÷125÷8=300÷（125×8）=300÷1000=0.3 396-96-172-28 =（396-96）-（172+28）= 300-200 = 100 125*24 = 125*8*3 = 1000*3 = 3000 26*15 = （20+6）*15 = 20*15 + 6*15 = 300+90 =390 25*99*4 = 25*4*99 = 100*99 = 9900 250*32 = 250*4*8 = 1000*8 = 8000 （98+98+98+98）*25 = 4*98*25 = 4*25*98 = 100*98 = 9800
六年级简便运算怎么算?
