Economist.comSURVEYS The price of profligacy Sep 18th 2003 From The Economist print edition How bad is America's borrowing binge? \I JUST think it's a meaningless concept\That was the verdict of Paul O'Neill, George Bush's plain-spoken first Treasury secretary on the current-account deficit. Mr O'Neill reckoned it was silly to worry about external imbalances in a global economy where capital flows

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1.(补充习题)判断以下公式对是否可合一若可合一,则求出最一般的合一 (3)P(f(x),y),P(y,f(b)) 解:令O=,S={p(f(x),y),P(y,f(b))} ①差异集为{f(x),y},做替换{f(x)/y},则 1=0of(x)y}={f(x)/y} S1 =S, ={P((x), f (x), P( f(x),(b)); ②差异集为{x,b},做替换{b/x},则

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