因式分解三道题,高手速来.
-x^2-4y^2
16+x^4
-3x^3+12x^5
人气:342 ℃ 时间:2020-06-13 05:00:07
解答
-x^2-4y^2=-(x²+4y²)
16+x^4=(x^4+8x²+16)-8x²=(x²+4)²-8x²=(x²+2√2x+4)(x²-2√2x+4)
-3x^3+12x^5=3x³(4x²-1)=3x³(2x+1)(2x-1)
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