已知x+y=0.2,x+3y=1,求3x²+12xy+12y²的值
3个回答
x+y=0.2,x+3y=1,2y=0.8 x=-0.2
3x²+12xy+12y²=3(x²+4xy+4y²)=3(x+2y)²=3*0.6²=1.08
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