问题 解答题
用简便方法计算.
①5%×9.9;
②4.62+9.9;
③4
2
3
×0.6+0.6÷
3
14
答案

①5%×9.9;,

=5%×(10-0.1),

=5%×10-5%×0.1,

=0.5-0.005,

=0.495;

②4.62+9.9,

=(4+0.62)+(10-0.1),

=(4+10)+(0.62-0.1),

=14+0.52,

=14.52;

③4

2
3
×0.6+0.6÷
3
14

=

14
3
×0.6+0.6×
14
3

=

14
3
×(0.6+0.6),

=

14
3
×1.2,

=

14
3
×
6
5

=

28
5

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