若向量a=(1,1),b=(-1,1),c=(4,2),则c=
A.3a+bB.3a-bC.-a+3bD.a+3b
上一篇 The angel, “I’ve suffered by back pain for years. Can you help68.
下一篇 菝葜属植物为攀缘灌木,其借助卷须攀缘。卷须是变态的()。A.茎B.叶片C.叶柄D.托叶
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