人教版五上数学

64.5×0.7＋35.5×0.7＝×0.7

0.9×2.7＋0.9×7.3＝0.9×

46.8×2.1＋53.2×2.1＝100×

6.8×3.9＋3.2×3.9＝(6.8＋)×3.9

(2.5＋7.5)×6.4＝2.5×6.4＋×6.4

28.6×1.5＋71.4×1.5＝×1.5

1.7×4.2＋8.3×4.2＝×4.2

3.4×2.3＋6.6×2.3＝×2.3

7.5×4＋7.5×8＝7.5×（4＋）

3.2×6＋6.8×6＝（3.2＋）×6