分式1x2-4有意义的条件是( ) A: x≠4 B: x≠2 C: x≠2或x≠-2 D: x≠2且x≠-2
分式1x2-4有意义的条件是( ) A: x≠4 B: x≠2 C: x≠2或x≠-2 D: x≠2且x≠-2
求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8
求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8
已知 x = { 1:1, 2:2 },那么执行语句 x[2] = 4之后,x的值为( )。 A: { 1:1, 2:2 } B: { 1:1, 2:4 } C: { 1:1, 4:2 } D: { 1:1, 4:4 }
已知 x = { 1:1, 2:2 },那么执行语句 x[2] = 4之后,x的值为( )。 A: { 1:1, 2:2 } B: { 1:1, 2:4 } C: { 1:1, 4:2 } D: { 1:1, 4:4 }
方程${{x}^{2}}{{y}^{''}}-(x+2)(x{{y}^{'}}-y)={{x}^{4}}$的通解是( ) A: $y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$ B: $y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{4}})$ C: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{4}})$ D: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$
方程${{x}^{2}}{{y}^{''}}-(x+2)(x{{y}^{'}}-y)={{x}^{4}}$的通解是( ) A: $y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$ B: $y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{4}})$ C: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{4}})$ D: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$
以4,9,1为为插值节点,求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)
以4,9,1为为插值节点,求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)
设函数f(x)=x2,0≤x≤1,而S(x)=,-∞≤x<+∞。其中,(n=1,2,…),则S(-1/2)等于()。 A: -1/2 B: -1/4 C: 1/4 D: 1/2
设函数f(x)=x2,0≤x≤1,而S(x)=,-∞≤x<+∞。其中,(n=1,2,…),则S(-1/2)等于()。 A: -1/2 B: -1/4 C: 1/4 D: 1/2
不等式4 A: {X|-2≤X<-1或<X≤} B: {X|-2≤X≤-1或<X≤} C: {X|-2≤X≤-1或≤X≤} D: {X|-2<X<-1或≤X≤}
不等式4 A: {X|-2≤X<-1或<X≤} B: {X|-2≤X≤-1或<X≤} C: {X|-2≤X≤-1或≤X≤} D: {X|-2<X<-1或≤X≤}
求函数[img=173x42]17da65390bf2806.png[/img]的导数; ( ) A: tan(pi/4 + x/2) B: (tan(pi/4 + x/2)^2/2 ) /tan(pi/4 ) C: (tan(pi/4 + x/2)^2/2 + 1/2) D: (tan(pi/4 + x/2)^2/2 + 1/2) /tan(pi/4 + x/2)
求函数[img=173x42]17da65390bf2806.png[/img]的导数; ( ) A: tan(pi/4 + x/2) B: (tan(pi/4 + x/2)^2/2 ) /tan(pi/4 ) C: (tan(pi/4 + x/2)^2/2 + 1/2) D: (tan(pi/4 + x/2)^2/2 + 1/2) /tan(pi/4 + x/2)
阅读下面程序,则disp语句所显示结果为()。x=1;while x~=5disp(x)x=x+1;end A: 1 3 2 4 B: 1 2 3 4 C: 2 3 4 5 D: 1 3 4 2
阅读下面程序,则disp语句所显示结果为()。x=1;while x~=5disp(x)x=x+1;end A: 1 3 2 4 B: 1 2 3 4 C: 2 3 4 5 D: 1 3 4 2
已知列表 x = [1, 2, 3],那么执行语句 x.insert(1, 4) 之后,x的值为___________。 A: [4, 1, 2, 3] B: [1, 4, 2, 3] C: [1, 2, 3, 4] D: [1, 1, 2, 2]
已知列表 x = [1, 2, 3],那么执行语句 x.insert(1, 4) 之后,x的值为___________。 A: [4, 1, 2, 3] B: [1, 4, 2, 3] C: [1, 2, 3, 4] D: [1, 1, 2, 2]