有以下方法脱式计算:1、(8+4)x125 =8X125+4X125 =1000+500 =15002、(8+4)x125 =(10+2)ⅹ125 =10x125+2x125 =1250+250 =1500
(8+4)x125=8x125+4x125=1000+500=1500