若a²-2ab+2b²-2bc+2c²-6c+9=0 则2a+b-3c=?
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![若a²-2ab+2b²-2bc+2c²-6c+9=0 则2a+b-3c=?](/uploads/image/z/3995280-0-0.jpg?t=%E8%8B%A5a%26%23178%3B-2ab%2B2b%26%23178%3B-2bc%2B2c%26%23178%3B-6c%2B9%3D0+%E5%88%992a%2Bb-3c%3D%3F)
若a²-2ab+2b²-2bc+2c²-6c+9=0 则2a+b-3c=?
若a²-2ab+2b²-2bc+2c²-6c+9=0 则2a+b-3c=?
若a²-2ab+2b²-2bc+2c²-6c+9=0 则2a+b-3c=?
a²-2ab+2b²-2bc+2c²-6c+9=0
a²-2ab+b²+b²-2bc+c²+c²-6c+9=0
(a-b)²+(b-c)²+(c-3)²=0
∴a-b=0
b-c=0
c-3=0
∴a=b=c=3
∴2a+b-3c=18