题目内容

3871-(1080-740)×7  
125×5.4-4.6×125.
12.5×(4×0.8)×2.5
30-[17.8+(6.2+38÷10)].
(1)3871-(1080-740)×7 
=3871-340×7
=3871-2380
=1491;

(2)125×5.4-4.6×125
=125×(5.4-4.6)
=125×0.8
=100;

(3)12.5×(4×0.8)×2.5
=(12.5×0.8)×(4×2.5)
=10×10
=100;

(4)30-[17.8+(6.2+38÷10)]
=30-[17.8+(6.2+3.8)]
=30-[17.8+10]
=30-27.8
=2.2.
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