下面各题怎样简便就怎样计算.28×25 101×72 49.62十27.17-19.62 350÷14 24

2024-12-27 23:01:24
推荐回答(1个)
回答1:

①28×25,
=7×(4×25),
=7×100,
=700;

②101×72,
=(100+1)×72,
=100×72+72×1,
=7200+72,
=7272;

③49.62十27.17-19.62,
=49.62-19.62+27.17,
=30+27.17,
=57.17;

④350÷14,
=350÷7÷2,
=50÷2,
=25;

⑤24×19-24×9,
=24×(19-9),
=24×10,
=240;

⑥49×99+49,
=49×(99+1),
=49×100,
=4900.