(1)3.8×2.6×0.25=(1.9x2)x(1.3x2)x0.25=1.9x1.3x(4x0.25)=1.9x1.3=(1.9+0.1)x1.3-0.13=2.6-0.13=2.47(2)3.8×2.6×0.25=(3.8+0.2)x2.6x0.25-0.2x2.6x0.25=2.6x4x0.25-0.13x4x0.25=2.47
