当x减y等于2时,求代数式(x减y)的二次方加2(y减x)加5的值

问题描述:

当x减y等于2时,求代数式(x减y)的二次方加2(y减x)加5的值

x-y=2
(x-y)²+2(y-x)+5
=(x-y)²-2(x-y)+5
=2²-2×2+5
=5

解析
x-y=2

(x-y)²+2(y-x)+5
=(x-y)²-2(x-y)+5
=4-2x2+5
=9-4
=5

希望对你1有帮助
学习进步O(∩_∩)O谢谢


x-y=2
(x-y)²+2(y-x)+5
=(x-y)²-2(x-y)+5
=2²-2×2+5
=5