Eliminate
 Usage
• Eliminate[eqns, vars]用来消掉一个联立方程组中的变量.
Notes
• 方程以 lhs  rhs. 的形式给出. • 联立方程要么被组合在一个列表中，要么和&&一起被组合. • 变量可以是任意表达式.
• Eliminate主要对线性和多项式方程起作用.
 Further Examples
The variable specified in the second argument is eliminated from the system of equations.
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For readability, a warning message is temporarily turned off and then turned back on later.
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Eliminate also attempts to remove variables that appear in transcendental equations.
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See the Further Examples for Solve.
参见 Solve. 的进一步实例
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