用简便方法计算(写出计算过程):
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| (1)385+295+105 =385+(295+105) =385+400 =785; (2)643-12-88 =643-(12+88) =643-100 =543; (3)125×32 =125×8×4 =1000×4 =4000; (4)8×48×125 =8×125×48 =1000×48 =48000; (5)4200÷6÷7 =4200÷(6×7) =4200÷42 =100; (6)360÷45 =360÷9÷5 =40÷5 =8; (7)125×8+275×8 =(125+275)×8 =400×8 =3200; (8)99×84 =1100×84-1×84 =8400-84 =8316; (9)25×1-25 =25-25 =0. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35