一道数学题,智商高的来做
-5+7+2-4
=-_____-_____+_____+____
=-___+____
=_____.
..
麻烦解释+回答.
人气:421 ℃ 时间:2020-04-13 13:31:26
解答
-5+7+2-4
=-5-4+7+2
=-7+7
=0
将-号看成是负数,将+号看成是正数即可
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