12*13题,有好评
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12*13题,有好评
12*13题,有好评
12*13题,有好评
12、x^2-y^2=(x+y)(x-y)
13、(1)x^2+qx+px+pq=(x+q)(x+p)
(2)x^2+7x+6=x^2+1×x+6x+6=(x+1)(x+6)