3a+b=5 a+3b=-1 a=2 b=-1;
x=3 y=7 k=5;
a=-13/2;
x=-2 y=1 m=-1;
x=1 y=7 x=2 y=5 x=3 y=3 x=4 y=1;
x+y+3=0 2x-y-1=0 x=-2/3 y=-7/3;
x=5/3 y=3;
第二组为x 2x+3+x=48 x=15 第二组33；
3A + B = A +3 B = -1 A = 2 B = -1;
X = 3 Y = K = 5;
= -13 / 2;
所述= -2 Y = M = -1;
X = 1 Y = 7×= 2 Y = 5 X = 3 Y = 3 X = 4，Y = 1;
X + Y +3 = 2X-Y-1 = 0，x = -2 / 3 Y = -7 / 3;
X = 5/3 Y = 3;
组所述2X +3 + X = 48×= 15 33;
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