12x18x25x32用简便方法计算脱式计算=4×3×2×9×25×8×4=25×4×3×2×9×8×4=100×3×2×9×8×4=300×2×9×8×4=600×9×8×4=5400×8×4=43200×4=172800口算出来啦!
12x18x25x32用简便方法计算脱式计算=4x3x18x25x32=4x25x18x32x3=100x18x32x3=1800x32x3=57600x3=172800