作业帮如图,数轴上的两个点A,B所表示的数分别是a,b,在a+b,a-b,ab,丨a丨-丨b丨中是正数的有几个?
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如图,数轴上的两个点A,B所表示的数分别是a,b,在a+b,a-b,ab,丨a丨-丨b丨中是正数的有几个?
如图,数轴上的两个点A,B所表示的数分别是a,b,在a+b,a-b,ab,丨a丨-丨b丨中
是正数的有几个?
如图,数轴上的两个点A,B所表示的数分别是a,b,在a+b,a-b,ab,丨a丨-丨b丨中是正数的有几个?
a+b＜0,a－b＞0,|a|－|b|＜0,是正数的有一个,是a－b.原因就是在这个图上a的绝对值大于b的绝对值,-b＞a,剩下的慢慢去推理就可以了.
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From this picture of real number axis, we can concluded that the real number a is a positive number while the real number b is negative number, so ab is a nega...
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我心血来潮，想用英语回答你好不好啊？
声明一下，免得你以为我灌水
From this picture of real number axis, we can concluded that the real number a is a positive number while the real number b is negative number, so ab is a negavite number, and a-b should be a positive number.
And the number b has a longer distance from the number 0 than a's.
In other words, the absolute value of b is bigger than the number a, so the number a+b is a negative number, |a|-|b|, which means the different between absolute values of a and b, should be a negative number.
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