| 混合运算. 25×4-240÷4 128-28×3+17 600-(697÷41+274) [300-(56+44)]÷25. |
| (1)25×4-240÷4 =100-60 =40; (2)128-28×3+17 =128-84+17 =44+17 =61; (3)600-(697÷41+274) =600-(17+274) =600-291 =309; (4)[300-(56+44)]÷25 =[300-100]÷25 =200÷25 =8. |
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