25X16X125 =25X4X4X125=100X500=500000或25X16X125 =25X2X8X125=50X1000=500000常见化简算式,应牢记:125X8=100025X4=100
要对25,125敏感一些啊原式=25×8×2×125=1000×50=5000
25x16x125=(25x2)x(125x8)=1000x50=50000
1100