阅读下面式子变形x^2+2x-3x=x^2+2x+1-4=(x+1)^2-2^2=(x+1+2)(x+1-2)=(x+3
1个回答
原式=x^-6x+9-10
=(x-3)^2-(√10)^2
=(x-3+√10)(x-3-√10)
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