13.A={a11a21a31,a12a22a32,a13a23a33},B={a11a21a31,3a12 3a22 3a32,a13a23a33},p={1 0 0,0 1 0,0 0 1},Q={1 3 0,0 1 0,0 0 1},则B=( )
Given the following two tables:
TAB1 C1 C2
A 11 B 12 C 13 TAB2 CX CY
A 21 C 22 D 23
The following results are desired:
C1 C2 CX CY
A 11 A 21 C 13 C 22 -- --D 23
Which of the following queries will yield the desired results?()
设D=,求A11+A12+A13+A14=()。其中A1j为元素
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