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高等数学(下)模拟 七 一. 填空题(每空 3 分,共 24 分) z 1 1.二元函数 (x2 y2 ) 25 x2 y2 的定义域为 21 2.一阶差分方程 yt1 3 yt 5 的通解为 3. z x y 的全微分 dz _ 4. ydx xdy 0 的通解为 ___ z arctan y z 5.设 x ,则 x ___ 6.微分方程 y 2y 5y 0 的通解...
(1)任一连通图必有支撑树 (2)任一连通图生成的支撑树必唯一(3)在支撑 树中再增加一条边后必含圈(4)任一连通图生成的各个支撑树其边数必相同 4.在下图中,(abcd)不是根据(a)生成的支撑树。 5.从赋权连通图中生成最小树,以下叙述(124)不正确。 (1)任一连通图生成的各个最小树,其总长度必相等(2)任...