Question

已知xy满足根号y等于根号二分之一x减一加根号1减二分之一x再加3 则y的x方等于多少

Answer 1

∵x-1/2≥0

1/2-x≥0

∴x=1/2

∴带人x求得y=3

∴|5x+2y-1|-√(y²-8y+16)

=|2.5+6-1|-√[9-24+16]

=7.5-1

=6.5