x+y=0.2,x+3y=1,求3x²+12xy+12y²的值
6个回答
x+y=0.2,x+3y=1
两式相加
2x+4y=1.2
x+2y=0.6
3x²+12xy+12y²
=3(x^2+4xy+4y^2)
=3(x+2y)^2
=3×0.6×0.6
=1.08
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