A.1 | B.2 | C.3 | D.4 |
A.0个 | B.1个 | C.2个 | D.3个 |
A.平行四边形 | B.矩形 | C.菱形 | D.梯形 |
A.4,6,1,7 | B.7,6,1,4 | C.6,4,1,7 | D.1,6,4,7 |
|
A.a11+a12+…+a1k+a21+a22+…+a2k |
B.a11+a21+…+ak1+a12+a22+…+ak2 |
C.a11a12+a21a22+…+ak1ak2 |
D.a11a21+a12a22+…+a1ka2k |
A.0 | B.6 | C.12 | D.18 |
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