Suppose A = O b. O e. a21 639&&&)- a11 a12 931 - 2021 a32-2a22 a33-2a23_ 选择一项: O a. 1 0 0 0 -2 a11 a12 a13 a21 a22 a23 B = -2 a31 a32 a33 01 1 00 10 1 0 -2 1 0 0 1 O c. None of the others. O d. 1 00 010 0 1 10 0 1 0 00 1 022 a23 a13 and E₁ = 0 1 1 0 0 0 0 0. If E₂E₁A= B, then what is E₂? 1

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