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因式分解:
9n²-4m²-1+4m
(x²-3x)²-8(x²-3x)-20
(2x-y)²-(3x+y)²
人气:295 ℃ 时间:2020-07-21 18:05:22
解答
9n²-4m²-1+4m=9n²-(4m²-4m+1)=9n²-(2m-1)²=(3n+2m-1)(3n-2m+1)(x²-3x)²-8(x²-3x)-20=[(x²-3x)-10][(x²-3x)+2]=(x²-3x-10)(x²-3x+2)=(x-5)(x+2)(...
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