下面各题怎样算简便就怎样算.5.44+17.8+4.56 &...
下面各题怎样算简便就怎样算.5.44+17.8+4.5624.8-3.89-7.1147.8-(17.8+0.96)16.78-6.5+3.22-3.5....
下面各题怎样算简便就怎样算.5.44+17.8+4.56 24.8-3.89-7.1147.8-(17.8+0.96)16.78-6.5+3.22-3.5.
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(1)5.44+17.8+4.56,
=5.44+4.56+17.8,
=10+17.8,
=27.8;
(2)24.8-3.89-7.11,
=24.8-(3.89+7.11),
=24.8-11,
=13.8;
(3)47.8-(17.8+0.96),
=47.8-17.8-0.96,
=30-0.96,
=29.04;
(4)16.78-6.5+3.22-3.5,
=(16.78+3.22)-(6.5+3.5),
=20-10,
=10.
=5.44+4.56+17.8,
=10+17.8,
=27.8;
(2)24.8-3.89-7.11,
=24.8-(3.89+7.11),
=24.8-11,
=13.8;
(3)47.8-(17.8+0.96),
=47.8-17.8-0.96,
=30-0.96,
=29.04;
(4)16.78-6.5+3.22-3.5,
=(16.78+3.22)-(6.5+3.5),
=20-10,
=10.
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