首先给出了l(y,z)的参数表达式,然后利用拉格朗日反演得到了它的精确解,即得到了以根节点次、内面个数为两个参数的根面次是2的当λ=3时的色和的精确表达式,另外用非常简单不同干已经存在的方法导出了以内面个数为参数的精确解.%A parametric expression of l (y, z) is derived, then byusing lagrangian inversion, an explicit expression of chromatic sumsfor rooted near planar triangulations with the rooted face valency 2and λ = 3 is obtained by the valency of the root - vertex and thenumber of inner faces as two parameters. Furthermore, that with thenumber of inner faces is derived in a different and much simplermanner from what exists.
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