用简便方法计算.3.5×9.9 &n...
用简便方法计算.3.5×9.94.62+9.934×0.6+0.6÷4....
用简便方法计算.3.5×9.9 4.62+9.9 34×0.6+0.6÷4.
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推荐于2016-06-07
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(1)3.5×9.9,
=3.5×(10-0.1),
=3.5×10-3.5×0.1,
=35-0.35,
=34.65;
(2)4.62+9.9,
=4.62+10-0.1,
=14.52;
(3)
×0.6+0.6÷4.
=
×0.6+0.6×
,
=(
+)×0.6,
=1×0.6,
=0.6.
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