下面各题怎样简便就怎样算.(1)64×101;(2)18.3-6.25-3.75;(3)4×1.75×25;(4)50-(2.38+1.75
下面各题怎样简便就怎样算.(1)64×101;(2)18.3-6.25-3.75;(3)4×1.75×25;(4)50-(2.38+1.75);(5)73×17+83×7...
下面各题怎样简便就怎样算.(1)64×101;(2)18.3-6.25-3.75;(3)4×1.75×25;(4)50-(2.38+1.75);(5)73×17+83×73;(6)120×4-420÷14.
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(1)64×101
=64×(100+1)
=64×100+1×64
=6400+64
=6464;
(2)18.3-6.25-3.75
=18.3-(6.25+3.75)
=18.3-10
=8.3;
(3)4×1.75×25
=4×25×1.75
=100×1.75
=175;
(4)50-(2.38+1.75)
=50-4.13
=45.87;
(5)73×17+83×73
=(17+83)×73
=100×73
=7300;
(6)120×4-420÷14
=480-30
=450.
=64×(100+1)
=64×100+1×64
=6400+64
=6464;
(2)18.3-6.25-3.75
=18.3-(6.25+3.75)
=18.3-10
=8.3;
(3)4×1.75×25
=4×25×1.75
=100×1.75
=175;
(4)50-(2.38+1.75)
=50-4.13
=45.87;
(5)73×17+83×73
=(17+83)×73
=100×73
=7300;
(6)120×4-420÷14
=480-30
=450.
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