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一個有理數和它的相反數之積一定是非正數.
一個絕對值加上一個平方數是0,說明兩部分都是0. 所以b=-2,3a=-2c 最小正整數是1,所以a=1,c=-1.5 -a^2+c^2+4=-1+2.25+4=5.25 4ab+c=-8-1.5=-9.5 a^2+c^2+4分之4ab+c=-19/11
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