计算:【(3√2)-(2√5)】的立方×【(3√2)+(2√5)】的立方
问题描述:
计算:【(3√2)-(2√5)】的立方×【(3√2)+(2√5)】的立方
答
【(3√2)-(2√5)】³×【(3√2)+(2√5)】³
={[(3√2)-(2√5)][(3√2)+(2√5)]}³
=[(3√2)²-(2√5)²]³
=(18-20)³
=(-2)³
=-8