Question

己知x等于1减根号2，y等于1加根号2，求x平方加y平方减x乘y减2x加2y的值

Answer 1

x=1-√2,
y=1+√2.
x²+y²-xy-2x+2y
=(1-√2)²+(1+√2)²-(1-√2)(1+√2)-2(1-√2)+2(1+√2)
=(3-2√2)+(3+2√2)-(-1)+(-2+2√册或链2)+(2+2√2)
=7+4√2.
请点击团做右下角州孙的
[采纳答案]
谢谢