1.16×1.25×2.5=（4×0.29）×1.25×2.5=（4×2.5）×0.29×1.25=10×0.29×1.25=2.9×1.25=0.3×8×1.25+0.5×1.25=0.3×10+0.625=3+0.625=3.625
