2.78×101用简便方法计算
(2011•隆化县模拟)用简便方法计算399×101402×25+98×25125×32×0.253.78+[6.5-(3.5+2)]....
(2011•隆化县模拟)用简便方法计算
399×101
402×25+98×25
125×32×0.25
3.78+[6.5-(3.5+2)]. 展开
399×101
402×25+98×25
125×32×0.25
3.78+[6.5-(3.5+2)]. 展开
1个回答
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(1)399×101,
=399×(100+1),
=39900+399,
=40299;
(2)402×25+98×25,
=(402+98)×25,
=500×(20+5),
=10000+2500,
=12500;
(3)125×32×0.25,
=125×8×4×0.25,
=(125×8)×(4×0.25),
=1000×1,
=1000;
(4)3.78+[6.5-(3.5+2)],
=3.78+[6.5-3.5-2],
=3.78+1,
=4.78.
=399×(100+1),
=39900+399,
=40299;
(2)402×25+98×25,
=(402+98)×25,
=500×(20+5),
=10000+2500,
=12500;
(3)125×32×0.25,
=125×8×4×0.25,
=(125×8)×(4×0.25),
=1000×1,
=1000;
(4)3.78+[6.5-(3.5+2)],
=3.78+[6.5-3.5-2],
=3.78+1,
=4.78.
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