24×0.25×1.25=6×（4×0.25）×1.25=6×1.25=7.524×0.25×1.25=（0.25×3）×（8×1.25）=0.75×10=4.5
①3×0.25×（8×1.25）=0.75×10=7.5②6×1.25×（4×0.25）=7.5×1=7.5
24×0.25×1.25=8×3×0.25×1.25=（8×1.25）×（3×0.25）=10×0.75=7.5
