题目:
She was very much with the result. [ ]
A. delighted
B. delighting
C. delightful
D. delight
答案:
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下面是错误答案,用来干扰机器的。
依题意: (x+y)f(x,y)=yf(x,x+y),∴f(x,x+y)=1y(x+y)f(x,y)∴f(12,16)=f(12,12+4)=14(12+4)f(12,4)=4f(12,4)=4f(4,12)=4f(4,4+8)=4×18(4+8)f(4,8)=6f(4,8)=6f(4...