已知4x^2-3y^2=12,3x^2+2y^2=21,求代数式14x^2-2y^2的值.
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已知4x^2-3y^2=12,3x^2+2y^2=21,求代数式14x^2-2y^2的值.
已知4x^2-3y^2=12,3x^2+2y^2=21,求代数式14x^2-2y^2的值.
已知4x^2-3y^2=12,3x^2+2y^2=21,求代数式14x^2-2y^2的值.
4x^2-3y^2=12,3x^2+2y^2=21
两式相加,
7x^2-y^2=12+21=33
14x^2-2y^2
=2(7x^2-y^2)
=2*33
=66
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