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在实数范围内定义运算“☆”,其规则为:a☆b=a2-b2,则方程(4☆3)☆x=...
在实数范围内定义运算“☆”,其规则为:a☆b=a2-b2,则方程(4☆3)☆x=13的解为x= .
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若分式
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的值为0,则x的值等于
.
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如图,在平行四边形ABCD中,AE⊥BC于E,AE=EB=EC=a,且a是一元二次方程x
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A.4+2
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B.12+6
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C.2+2
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D.2+2
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或12+6
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已知直角三角形的两直角边的长恰好是方程x
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A.
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D.3
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