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解y=1/2x^2+3x+5/2 y=2x^2+m 有一個公共電 所以1/2x^2+3x+5/2=2x^2+m 3x^2-6x+4m-5=0 因為只有一個公共點 所以吧b^2-4ac=(-6)^2-4x3x(4m-5)=96-48m=0 所以m=2
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