用简便方法算一算。
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| (1)原式=(4×4)×125 = 4×(4×125) = 400 |
(2)原式= 48×(100-1) = 4800-48 = 4752 |
| (3)原式= 47×(100+1) = 4700+47 = 4747 |
(4)原式=(58+42)×17 =100×17 =1700 |
| (5)原式=(4×6)×25×5 =600×5 =3000 |
(6)原式=367×(1+19) =367×20 =7340 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35