l a b c l l 2a 3a+2b 4a+3b+2c l l 3a 6a+3b 10a+9b+3c l 用行列式的性质计算
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l a b c l l 2a 3a+2b 4a+3b+2c l l 3a 6a+3b 10a+9b+3c l 用行列式的性质计算
l a b c l l 2a 3a+2b 4a+3b+2c l l 3a 6a+3b 10a+9b+3c l 用行列式的性质计算
l a b c l l 2a 3a+2b 4a+3b+2c l l 3a 6a+3b 10a+9b+3c l 用行列式的性质计算
r3-r1-r2,r2-2r1
a b c
0 3a 4a+3b
0 3a 6a+6b
r3-r2
a b c
0 3a 4a+3b
0 0 2a+3b
= 3a^2(2a+3b).
3(2a+3b)a^2
化简:l a-b l + l a+c l - l b-c l + l 2c l,当a=-3,c=-2.
l a b c l l 2a 3a+2b 4a+3b+2c l l 3a 6a+3b 10a+9b+3c l 用行列式的性质计算
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