用简便方法计算.728-403; 46×99+46; 3600÷45÷20; 758-436-264+442.
728-403
=728-400-3
=325;
46×99+46
=46×(99+1)
=46×100
=4600;
3600÷45÷20
=3600÷(45×20)
=3600÷900
=4;
758-436-264+442
=(758+442)-(436+264)
=1200-700
=500.
=728-400-3
=325;
46×99+46
=46×(99+1)
=46×100
=4600;
3600÷45÷20
=3600÷(45×20)
=3600÷900
=4;
758-436-264+442
=(758+442)-(436+264)
=1200-700
=500.
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