能简算的用简便方法计算.(写出主要简便过程,无过程不得分)
①1.6×3.9×1.25 ②4.87×2.34+48.7×0.266 ③0.05×0.7×20×1.7
④2.5×3.2×12.5 ⑤3.95×7.6+3.95×3.4﹣3.95 ⑥0.49×9.9.
能简算的用简便方法计算.(写出主要简便过程,无过程不得分)
①1.6×3.9×1.25 ②4.87×2.34+48.7×0.266 ③0.05×0.7×20×1.7
④2.5×3.2×12.5 ⑤3.95×7.6+3.95×3.4﹣3.95 ⑥0.49×9.9.