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;很高兴为您解答,流眸...
计算:(-5a^6)²+(-3a³)³.a³ 计算:(x-2)(x+7)-2(3
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