①2.8×1.6+4.2
②2.5×53×0.4
③0.48×0.7+0.52×0.7
④28.6×101-28.6
⑤(8+0.8)×0.125
⑥3.8×0.9+0.38
⑦1.25×25×3.2
⑧6.7+3.3×0.42