题目内容

384+98×25×4
2.724+26×24+724
3.102×78
4.45×27-45×17.
(1)384+98×25×4
=384+98×(25×4)
=384+9800
=10184;

(2)724+26×24+724
=724+624+724
=1348+724
=2072;

(3)102×78
=(100+2)×78
=100×78+2×78
=7800+156
=7956;

(4)45×27-45×17
=45×(27-17)
=45×10
=450.
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