若x²+y²-4x+6y+13=0,则x²+6xy+9y²=( )

883767442022-10-04 11:39:542条回答

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2goz 共回答了21个问题 | 采纳率90.5%
x²+y²-4x+6y+13=0
(x-2)²+ (y-3)² = 0
所以:x=2 ,y =-3
x²+6xy+9y²=(x+3y)²=(2-9)²=49
1年前
wangyong1979 共回答了10个问题 | 采纳率
49
1年前

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wnn561年前1
景之枫 共回答了9个问题 | 采纳率55.6%
=(x-y)/(x+3y)×(x+3y)²/(x-y)(x+y)-2y/(x+y)
=(x+3y)/(x+y)-2y/(x+y)
=(x+3y-2y)/(x+y)
=1