1. (DS) Is (负的根号3△5)#(5△ 负的根号3) equal to zero? (1)X△Y=Y#X (2)X#X=0 当初考场上写C,但现在想想是E? 不知是我题目记忆错误还是我根本写错了,求讨论
2. JJ风筝那题tail 是下垂(和地面垂直) ans:29.5
3. math GWD-11 Q6原题,一模一样 For all integers x and y, the operation△is defined by x△y = (x+2)^2 + (y+3)^2. What is the value of integer t? (1) t△2 = 74 (2) 2△t = 80 我选C
4.(DS) Is a^2+b^2+c^2=(a+b+c)^2? (1) [(1/a)+(1/b)+(1/c)]=0 (2) a^2=b^2=4 我选A