128*(8*4) =125*8*4 =1000*4 =4000
简便计算125x(8X4)=125x8x4=1000x4=4000
=125x2=250
125*(8+4)=125*8+125*4=1000+500=1500望采纳,谢谢
125x(8+4)=125*(8+2+2)=125*(10+2)=125*10+125*2=1250+250=1500
简便计算125x(8+4)*25=125x12x25=125x4x3x25=(125x3)x(25x4)=375x100=37500
原式=125*8+125*4=1000+500=1500
1/4*125*4*8=1/4* 4*125*8=125*8 =1000
125x(8+4)=125*8+125*4=1000+500=1500