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计算3(2x+1)(2x-1)-4(3x-2)(3x+2)+6x(4x+1)
人气:326 ℃ 时间:2020-03-23 13:40:17
解答
3(2x+1)(2x-1)-4(3x-2)(3x+2)+6x(4x+1)
=3(4x^2-1)-4(9x^2-4)+24x^2+6x
=12x^2-3-36x^2+16+24x^2+6x
=6x+13.
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