编写要求：
源码 A:=P1+(100-P1)/2; B:=(100-P1)/2; CC:=COST(A); DD:=COST(B); SCR:(CC-DD)/(CC+DD)*100/2;
股票网解答：
a:=p1+(100-p1)/2;
b:=(100-p1)/2;
cc:=cost(a);
dd:=cost(b);
scr:=(cc-dd)/(cc+dd)*100/2;
scr-ref(scr,1)>1;
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