脱式计算。（能简算的要简算）

①（4+0.4）×2.5

②8×7×0.125

③21.21+38.38+9.79+2.62

④10-2.3×1.2

⑤7.64×0.5-2.95

⑥3.26×5.7-3.26×0.7