"We have become a nation of extremes, at least within our government, with the liberals on the Democratic side and the conservatives on the Republican side over-represented in the Congress of the United States."
VOA: standard.2010.05.04
As long as we understand that, we can do this cancellation and this says on the left-hand side the change in the quantity v square over 2 is a times the change in the quantity x.
只要我们明白这一点,我们就可以这样做简化,在等号左边,v^/2的变化量,为a乘以x的变化量
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