4x(2x-1)-(x-3)(x+3), (p+3)(p-3)+(p+6)², 7(a+b)²-14ab -преобразуйте в многочлен y³-49y, -3a²-6ab-3b²-разложите на множители
(y-6)²-9y², c²-d²-c+d-представьте в виде произведения
(x-y)²+(x+y)²=2(x²+y²)-докажите тождество
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