(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x)
题型:解答题难度:一般来源:不详
(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x) |
答案
(3x-2y-5)(3x+2y-5)-2x(6x+y)-(3x-y)(-y-x), =(3x-5)2-4y2-12x2-2xy+3xy-y2+3x2-xy, =9x2-30x+25-4y2-12x2-2xy+3xy-y2+3x2-xy, =-30x+25-5y2. |
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