用简便的方法计算下面各题4,5×0.9+5.5×0.9 7.69×101 2.5×(7.2×0...
用简便的方法计算下面各题4,5×0.9+5.5×0.97.69×1012.5×(7.2×0.04)72×l.250.26×10.1-0.26×0.10.25+39×0.2...
用简便的方法计算下面各题4,5×0.9+5.5×0.9 7.69×101 2.5×(7.2×0.04)72×l.25 0.26×10.1-0.26×0.1 0.25+39×0.25.
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(1)4.5×0.9+5.5×0.9,
=(4.5+5.5)×0.9,
=10×0.9,
=9;
(2)7.69×101,
=7.69×(100+1),
=7.69×100+7.69×1,
=769+7.69,
=776.69;
(3)2.5×(7.2×0.04),
=7.2×(2.5×0.04),
=7.2×0.1,
=0.72;
(4)72×l.25,
=(8×9)×1.25,
=(8×1.25)×9,
=10×9,
=90;
(5)0.26×10.1-0.26×0.1,
=0.26×(10.1-0.1),
=0.26×10,
=2.6;
(6)0.25+39×0.25,
=0.25×(1+39),
=0.25×40,
=10.
=(4.5+5.5)×0.9,
=10×0.9,
=9;
(2)7.69×101,
=7.69×(100+1),
=7.69×100+7.69×1,
=769+7.69,
=776.69;
(3)2.5×(7.2×0.04),
=7.2×(2.5×0.04),
=7.2×0.1,
=0.72;
(4)72×l.25,
=(8×9)×1.25,
=(8×1.25)×9,
=10×9,
=90;
(5)0.26×10.1-0.26×0.1,
=0.26×(10.1-0.1),
=0.26×10,
=2.6;
(6)0.25+39×0.25,
=0.25×(1+39),
=0.25×40,
=10.
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