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((3x-7)^2-(x+5)^2)/(4x-24).2,((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/25 14:57:07
((3x-7)^2-(x+5)^2)/(4x-24).2,((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1)^2 计算
((3x-7)^2-(x+5)^2)/(4x-24).2,((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1)^2 计算 急
((3x-7)^2-(x+5)^2)/(4x-24).
=(3x-7+x+5)(3x-7-x-5)/(4x-24)
=(4x-2)(2x-12)/(4x-24)
=4(2x-1)(x-6)/4(x-6)
=2x-1
((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1)^2
=[(x^2+1)-2]^2/(x-1)^2
=(x^2-1)^2/(x-1)^2
=(x-1)^2(x+1)^2/(x-1)^2
=(x+1)^2
=x^2+2x+1