计算:(-5a^6)²+(-3a³)³.a³ 计算:(x-2)(x+7)-2(3-x)(2+x)
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计算:(-5a^6)²+(-3a³)³.a³ 计算:(x-2)(x+7)-2(3-x)(2+x)
计算:(-5a^6)²+(-3a³)³.a³ 计算:(x-2)(x+7)-2(3-x)(2+x)
计算:(-5a^6)²+(-3a³)³.a³ 计算:(x-2)(x+7)-2(3-x)(2+x)
计算:(-5a^6)²+(-3a³)³.a³
=25a^12-27a^12
=-2a^12;
计算:(x-2)(x+7)-2(3-x)(2+x)
=x²+5x-14-2(6+x-x²)
=x²+5x-14-12-2x+2x²
=3x²+3x-26;
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(-5a^6)²+(-3a³)³.a³
=25a¹²-27a¹²
=-2a¹²
(x-2)(x+7)-2(3-x)(2+x)
=x²+5x-14-12-2x+x²
=2x²+3x-26