若(–x–1)²+4|y-6|=0,则5x+6y-4-8y=

2025-03-05 00:49:10
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回答1:

(–x–1)²+4|y-6|=0

-x-1=0
y-6=0

x=-1
y=6

5x+6y-4-8y
=5x-2y-4
=-5-12-4
=-21