1.x^4+3x²y²+4y^4 2.x^4+4 3.x²-2x-a²+2a 4.(x+y)²-4x-4y+4
1.x^4+3x²y²+4y^4 2.x^4+4 3.x²-2x-a²+2a 4.(x+y)²-4x-4y+4 5.x(x-2)-a(a-2) 6.(x+y)²-4(x+y-1)
人气:151 ℃ 时间:2019-10-27 02:48:09
解答
1.x^4+3x²y²+4y^4 =x^4+4x²y²+4y^4-x²y²=(x^2+2y^2)^2-x²y²=(x^2+2y^2-xy)(x^2+2y^2+xy) 2.x^4+4 =x^4+4x^2+4-4x^2=(x^2+2)^2-4x^2=(x^2+2-2x)(x^2+2+2x)3.x²-2x-a&su...
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