[y(x-y)+x(x+y)-x²]÷(-y)
=(xy-y^2+x^2+xy-x^2)÷(-y)
=(2xy-y^2)÷(-y)
=-2x+y
[y(x-y)+x(x+y)-x²]÷(-y)要过程
[y(x-y)+x(x+y)-x²]÷(-y)要过程
数学人气：100 ℃时间：2020-05-21 23:15:35
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