计算下面各题，能简算的要简算

①12.5×3.2×0.25

②13.5×10.1

③7.56÷1.25÷8

④1.25×3.8×8

⑤2.5×4.8+4.8×7.5

⑥6.43×2.78+6.43×8.12-6.43