用简便方法计算: 1.29+3.7+0.71+6.3 528×78+472×78 125×89×8 57×101.
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(1)1.29+3.7+0.71+6.3,
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)528×78+472×78,
=(528+472)×78,
=1000×78,
=78000;
(3)125×89×8,
=125×8×89,
=1000×89,
=89000;
(4)57×101,
=57×(100+1),
=57×100+57,
=5700+57,
=5757.
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)528×78+472×78,
=(528+472)×78,
=1000×78,
=78000;
(3)125×89×8,
=125×8×89,
=1000×89,
=89000;
(4)57×101,
=57×(100+1),
=57×100+57,
=5700+57,
=5757.
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