用简便方法计算.①5%×9.9;②4.62+9.9;③423×0.6+0.6÷314.-数学

题目简介

用简便方法计算.①5%×9.9;②4.62+9.9;③423×0.6+0.6÷314.-数学

题目详情

用简便方法计算.
①5%×9.9;
②4.62+9.9;
③4
2
3
×0.6+0.6÷
3
14
题型:解答题难度:中档来源:不详

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;

③4class="stub"2
3
×0.6+0.6÷class="stub"3
14

=class="stub"14
3
×0.6+0.6×class="stub"14
3

=class="stub"14
3
×(0.6+0.6),
=class="stub"14
3
×1.2,
=class="stub"14
3
×class="stub"6
5

=class="stub"28
5

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