II.- Productos notables

261.262.
\large (a+c)^{2}\large (x+2)^{2}
263.264.
\large (3x+2)^{2}\large (x^{2}+1)^{2}
265.266.
\large (m+2n)^{2}\large (2x+3y)^{2}
267.268.
\large (x-y)^{2}\large (x-2)^{2}
269.270.
\large (4x-5)^{2}\large (3x^{2}-2)^{2}
271.272.
\large (4x^{2}-5x)^{2}\large (\frac{x}2{+1})^{2}
273.274.
\large (x-\frac{1}{2})^{2}\large (\frac{x}{4}-y)^{2}
275.276.
\large (\frac{2x}{3}+\frac{y}{4})^{2}\large (\frac{3a}{5}-\frac{5b}{3})^{2}
277.278.
\large (m+n)(m-n)\large (a+2)(a-2)
279.280.
\large (x+1)(x-1)\large (a^{2}+1)(a^{2}-1)
281.
\large (10d+u)(10d-u)
282.
\large (3a+5)(3a-5)
283.
\large (6x-4y)(6x+4y)
284.
\large (x^{2}-y^{2})(x^{2}+y^{2})
285.
\large (a^{3}+b^{3})(a^{3}-b^{3})
286.
\large (x^{4}-y^{4})(x^{4}+y^{4})
287.
\large (2a^{2}-b^{2})(b^{2}+2a^{2})
288.
\large (3m^{2}-5n^{2})(5n^{2}+3m^{2})
289.
\large (4ab-3xy)(4ab+3xy)
290.291.
\large (m+n)^{3}\large (x-y)^{3}
292.293.
\large (x+1)^{3}\large (x-2)^{3}
294.295.
\large (4+a)^{3}\large (2x+y)^{3}
296.297.
\large (3x-2y)^{3}\large (a+5)^{3}
298.299.
\large (a+5)^{3}\large (\frac{x}{4}-\frac{y}{5})^{3}
300.
\large (x^{2}+xy+y^{2})(x-y)
301.
\large (x^{2}-xy+y^{2})(x+y)
302.
\large (x^{2}+2x+4)(x-2)
303.
\large (x^{2}-3x+9)(x+3)
304.
\large (4x^{2}+2xy+y^{2})(2x-y)
305.306.
\large (x+a)(x+b)\large (x+2)(x+5)
307.308.
\large (x-5)(x-7)\large (x+4)(x-9)
309.310.
\large (2x-1)(2x+5)\large (1+8x)(1-5x)
311.
\large (x+y)^{2}-(x-y)^{2}
312.
\large (3a-2b)^{2}+(3a+2b)^{2}
313.
\large (x+a)^{2}-(x-a)^{2}+ \large (x+a)(x-a)
314.
\large (x+y)^{3}-(x-y)^{3}
315.
\large (a+b)^{2}(a-b)- \large (a-b)^{2}(a+b)
316.
\large (x+y)^{2}-(x+y)(x-y)
317.
\large (2x+3y)^{2}-(2x-3y)^{2}
318.
\large (4a-3b+2c)^{2}- \large (4a+3b-2c)^{2}
319.
\large (x+y)^{3}+(x-y)^{2}
320.
\large 5a^{2}+(2a-5b+4c)^{2}- \large 21b^{2}-(3a-2b^{})^{2}+8ab

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