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众所周知,列方程(组)解应用题时,一般情况下设几个未知数就要列出几个方程,然后去解由这几个方程所组成的方程组.但有时也
It is well known that when solving equations (groups) to solve an application problem, generally several equations are listed with several unknowns, and then the equations composed of the several equations are solved. However, sometimes