数学巧算计算题,大家进来看看.
问题描述:
数学巧算计算题,大家进来看看.
当x=(3根号3) y=根号2
求(x-y)(x+y)(x^2-xy+y^2)(x^2+xy+y^2) 的值
(抱歉啊,根号打不出来)
答
x=3√3x²=27y=√2y²=2原式=[(x-y)(x²+xy+y²)][(x+y)(x²-xy+y²)]=(x³-y³)(x³+y³)=x^6-y^6=(x²)³-(y²)³=27³-2³=19675