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178. 17649-!-item-!-187;#058&011192 Ifthere are more than two numbers in a certain list, is each of the numbers inthe list equal to 0 ? (1) The product of any two numbers in the list isequal to 0. (2) The sum of any two numbers in the list isequal to 0. --------------------------------------------------------------------------------------------------------------------------------------------------------【答案】B 【思路】(1)任何數相乘只要數列有一個0,乘積為0,但不代表數列均為0,不充份 (2)任何數相加為0,其必為兩個0,充份
条件1假如数列是o,1,2,3,4这样的,那任何2个数相乘的话,2*3就不是0啊,我觉得任意2数相乘都是0的话,那必须所有的数都是0呀 |
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