Reduce
 Usage
• Reduce[eqns, vars] 化简变量vars的方程 eqns. 由 Reduce 生成的方程与eqns等价,并包含了所有可能的解.
• Reduce[eqns, vars, elims] 化简方程, 并试图消去变量 elims.
Notes
• Reduce所使用的方程形式为 lhs  rhs. 联立方程组要么用一个列表给出,要么与 &&组合. • 例如: Reduce[a x + b 0, x]  . • Reduce 生成与 &&以及 ||组合的等式 ( )和不等式 (  ), • Reduce 主要处理多项式方程.
 Further Examples
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This is an example of the three-argument form. We eliminate y and z, and attempt to solve for r and b; conditions are imposed on the remaining parameters.
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In the previous example the denominators were removed by cross multiplication. The presence of denominators makes this a harder problem.
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