Ответ:
а)x²+5x-3x+15=x²+2x+15
б)12x²y²+9x⁴-8y⁴-6x²y²=9x⁴-8y⁴+6x²y²
в)b⁶+b⁴-b²-b⁴-b²+1=b⁶-2b²+1
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Ответ:
а)x²+5x-3x+15=x²+2x+15
б)12x²y²+9x⁴-8y⁴-6x²y²=9x⁴-8y⁴+6x²y²
в)b⁶+b⁴-b²-b⁴-b²+1=b⁶-2b²+1