c4-c3,c3-c2,c2-c1
a^2 2a+1 2a+3 2a+5
b^2 2b+1 2b+3 2b+5
c^2 2c+1 2c+3 2c+5
d^2 2d+1 2d+3 2d+5
c4-c3,c3-c2
a^2 2a+1 2 2
b^2 2b+1 2 2
c^2 2c+1 2 2
d^2 2d+1 2 2
行列式3,4列相同,故行列式=0.
用行列式性质计算.a^2 (a+1)^2 (a+2)^2 (a+3)^2 b^2 (b+1)^2 (b+2)^2 (b+
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