| 27×2×5 35×5×8 25×15×6 125×16 25×24. |
| (1)27×2×5, =27×(2×5), =27×10, =270; (2)35×5×8, =35×(5×8), =35×40, =140; (3)25×15×6, =25×(15×6), =25×90, =2250; (4)125×16, =125×(8×2), =(125×8)×2, =1000×2, =2000; (5)25×24, =25×(4×6), =(25×4)×6, =100×6, =600. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35