10,11,
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10,11,
10,11,
10,11,
很久没做了不一定对平方符号打不出
10.(x+y)/(2x-2y)=(x+y)(x-y)/2(x-y)平方
xy/(x-y)平方=2xy/2(x-y)平方
11.(x-y)/(x+y)上下同乘x+y
12.简化后是(x+3)/(x-3) 答案是-1/5