【单选题】【消耗次数:1】
若关于x的一元二次方程kx2+4x+3=0有实数根,则k的非负整数值是( )
0,1
1
1,2
1,2,3
参考答案:
复制
纠错
相关题目
【单选题】 已知inta[4][4]={{1,2},{3},{4},{1,2,3}};问a[2][0]该元素的值是()
①  2
②  3
③  4
④  1
【简答题】 设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R3={|x, y∈Xùx2≤y},则求R3(3)。
【判断题】 设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R2={|x, y∈Xùy-1y+2},则R2(-1) ={ -2, -1}.
①  正确
②  错误
【简答题】 求方程组<img class="jc-formula" data-tex="\begin{ cases } x_{ 1 }-{ x }_{ 2 }-{ x }_{ 3 }+{ x }_{ 4 }=0 \\ { x }_{ 1 }-{ x }_{ 2 }+{ x }_{ 3 }-3{ x }_{ 4 }=0 \\ { x }_{ 1 }-{ x }_{ 2 }-2{ x }_{ 3 }+3{ x }_{ 4 }=0 \end{ cases }" src="https://huaweicloudobs.ahjxjy.cn/D4C08D0A4459C36BE868755327686B0E.png" style="vertical-align: middle;"/>的全部解。
【简答题】 设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R2={|x, y∈Xùy-1y+2},则R2(-1) =[填空1]
【简答题】 设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R2={|x, y∈Xùy-1y+2},则求R2(-1)。
【单选题】 minZ=4x1+6x2,4x1+3x2≤24,x2≥9,x1,x2≥0,则()。
①  无可行解
②  有唯一最优解
③  有无界解
④  有多重解
【判断题】 若A={1,2,3},R={1,2},则R反对称。
①  正确
②  错误
【判断题】 若A={1,2,3},R={1,2},则R反自反。
①  正确
②  错误
【判断题】 若x1和x2是齐次线性方程组Ax=0的解,则x1-x2也是方程组Ax=0的解。
①  正确
②  错误
随机题目
【单选题】 Gone With The Wind is a ____ movie.
①  remarkable
②  perfect
③  indispensable
④  outstanding
【单选题】 The message is clear: Just as tea and banana can’t go together, ______ should the son of a low class family expect to marry the daughter of a nobleman.
①  either
②  not
③  neither
④  nor
【单选题】 The ____ Court is the highest court in the United States.
①  Superior
②  Super
③  Supreme
④  Great
【单选题】 Peter could hardly catch what I said, _____ he?
①  could
②  couldn’ t
③  did
④  didn’ t
【单选题】 If you don’ t go to his birthday party next Friday,_____.
①  so do I
②  so will I
③  nor do I
④  nor will I
【单选题】 A culture in which the citizens share similar religious beliefs and values is more likely to have laws that represent the wishes of its people than where citizens come from _________ backgrounds.
①  identical
②  dramatic
③  extensive
④  diverse
【单选题】 _____ is it_____ made Peter_____ he is today?
①  What; that; that
②  That; that; what
③  What; what; that
④  What; that; what
【单选题】 It was during summer breaks that we first taste the satisfaction work that ____ into hard currency.
①  translates
②  transfers
③  transplants
④  transmits
【单选题】 At her word she stood up and walked away, stopping at the window to pull back the curtain and ____.
①  look round
②  look out
③  look up
④  look on
【单选题】 The linguists’ main interest had been to____ and describe languages.
①  analyze
②  express
③  command
④  comment