\left\{ \begin{array} { l } { a + b + c + d = 20 } \\ { 3a -2c = 3 } \\ { b + d = 6} \\ { c + b = 8 } \end{array} \right.
求解 a, b, c, d 的值
a = \frac{31}{5} = 6\frac{1}{5} = 6.2
b=\frac{1}{5}=0.2
c = \frac{39}{5} = 7\frac{4}{5} = 7.8
d = \frac{29}{5} = 5\frac{4}{5} = 5.8
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