(x+y)四次方-18
问题描述:
(x+y)四次方-18
答
原式
=(x+y)²-(3√2)²
=(x+y+3√2)(x+y-3√2)
(x+y)四次方-18
原式
=(x+y)²-(3√2)²
=(x+y+3√2)(x+y-3√2)