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listen,hear和sound的区别

"Listen," "hear," and "sound" are related words but have different meanings and usage in a sentence. 1. Listen: - It refers to the intentional act of paying attention to something or someone in order to hear and understand the sound. - It involves actively using one's ears and focusing on the sound or words being communicated. - Example: "Please listen carefully to the instructions." 2. Hear: - It refers to the perception of sound through the ears without any intentional effort. - It simply means that a sound is within the range of someone's auditory perception. - Example: "I can hear the birds chirping outside." 3. Sound: - It refers to the physical vibrations that travel through a medium (such as air or water) and reach our ears, resulting in the perception of sound. - It can be used as a noun or a verb. - As a noun, it refers to the vibrations themselves or the sensation they create. - Example: "The sound of the waves crashing on the shore is so soothing." - As a verb, it means to make a specific noise or to emit a particular sound. - Example: "The alarm clock sounded, waking me up." In summary, "listen" is an active action of focusing on a sound or speech, "hear" describes the perception of sound, and "sound" refers to the physical vibrations or the noise produced.
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"(4)6个连续自然数的平均数是75.5,这6个数中最小的数是()?"
6个连续自然数的平均数为75.5,代表平均数的第三个数。为了求出最小的数,我们需要算出第一个数。 平均数为75.5,所以总和为:6 * 75.5 = 453。 6个连续自然数的总和可以用等差数列的求和公式为:6/2 * (第一个数 + 最后一个数) = 6/2 * (第一个数 + 第一个数 +5) = 6/2 * (2 * 第一个数 + 5) = 3 * (2 * 第一个数 + 5)。 所以,3 * (2 * 第一个数 + 5) = 453。 解方程得到:2 * 第一个数 + 5 = 151,再解一次方程得到:2 * 第一个数 = 146,最后解得:第一个数 = 73。 因此,最小的数是73。
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2÷(2/3)+2/3÷2,运用乘法分配律怎么算?
我们可以使用乘法分配律将乘法运算转化为加法运算来计算: 首先,我们可以将2÷(2/3)转化为2*(3/2)。这是因为除法运算可以转化为乘法运算的倒数。 然后,我们可以将2/3÷2转化为(2/3)*(1/2)。 现在,我们可以将两个乘法运算转化为加法运算:2*(3/2) + (2/3)*(1/2)。 计算乘法:2*(3/2) = 3 和 (2/3)*(1/2) = 1/3。 得到:3 + 1/3。 接下来,我们需要找到这两个分数的公共分母。3可以写为3/1,而1/3已经是一个分数。 将3转化为通分的形式:3/1 * 3/3 = 9/3。 现在,我们可以将分数相加:9/3 + 1/3 = 10/3。 所以,2÷(2/3) + 2/3÷2的结果为10/3。
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