A: DSolve[2y[x]y"[x]==1+(y'[x])^2,y[0]==1,y'[0]==0,y[x],x
B: DSolve[{2y[x]y" [x]==1+(y'[x])^2,y[0]==1,y'[0]==0},y[x],x]
C: DSolve[{2y[x]y" [x]==1+(y^' [x])^2;y[0]==1;y'[0]==0},y[x],x]
D: DSolve[{2yy"==1+(y^' )^2&&y[0]==1&&y'[0]==0},y[x],x]
举一反三
- 分段函数：[img=206x91]18037123bea18f3.png[/img],下面程序段中正确的是__________。 A: If x < 0 Then y = 0If x < 1 Then y = 1If x < 2 Then y = 2If x >= 2 Then y = 3 B: If x > =2 Then y = 3ElseIf x > =1 Then y = 2ElseIf x > =0 Then y = 1Else y = 0End If C: If x >= 2 Then y = 3If x >= 1 Then y = 2If x > 0 Then y = 1If x < 0 Then y = 0 D: If x < 0 Then y = 0ElseIf x > 0 Then y = 1ElseIf x > 1 Then y = 2Else y = 3End If E: If x < 0 Then y = 0If 0 <= x <1 Then y = 1If 1 <= x < 2 Then y = 2If x >= 2 Then y = 3
- 【单选题】分段函数: ,下面程序段中正确的是__________。 A. If x < 0 Then y = 0 If x < 1 Then y = 1 If x < 2 Then y = 2 If x >= 2 Then y = 3 B. If x >= 2 Then y = 3 If x >= 1 Then y = 2 If x > 0 Then y = 1 If x < 0 Then y = 0 C. If x < 0 Then y = 0 ElseIf x > 0 Then y = 1 ElseIf x > 1 Then y = 2 Else y = 3 End If D. If x > =2 Then y = 3 ElseIf x > =1 Then y = 2 ElseIf x > =0 Then y = 1 Else y = 0 End If
- 下面程序段中正确的是( )。 A: If x＜0 Then y=0 If x＜1 Then y=1 If x＜2 Then y=2 If x＞=2 Then y=3 B: If x＞=2 Then y=3 If x＞1 Then y=2 If x＞=0Then y=1 If x＞0 Then y=0 C: If x＜0 Then y=0 Else If＞=0Then y=1 Else y=3 End If D: If x＞=2 Then y=3 Else If＞=1 Then y=2 Else y=0 End If
- 求解偏微分方程[img=178x28]18030731a73d552.png[/img], 应用的语句是 A: DSolve[(x^2+y^2)D[u,x]+x yD[u,y]==0,u,{x,y}] B: DSolve[(x^2+y^2)Dt[u[x,y],x]+xyDt[u[x,y],y]==0,u[x,y],{x,y}] C: DSolve[(x^2+y^2)D[u[x,y],x]+xyD[u[x,y],y]==0,u[x,y]] D: DSolve[(x^2+y^2)D[u[x,y],x]+xyD[u[x,y],y]==0,u[x,y],{x,y}]
- 分段函数：[img=203x91]17de5f2f296a7ac.jpg[/img],下面程序段中正确表达的是 。 A: If x >; =2 Then y = 3ElseIf x >; =1 Then y = 2ElseIf x >; =0 Then y = 1Else y = 0End If B: If x <; 0 Then y = 0If x <; 1 Then y = 1If x <; 2 Then y = 2If x >;= 2 Then y = 3 C: If x >;= 2 Then y = 3If x >;= 1 Then y = 2If x >; 0 Then y = 1If x <; 0 Then y = 0 D: If x <; 0 Then y = 0ElseIf x >; 0 Then y = 1ElseIf x >; 1 Then y = 2Else y = 3End If E: If x <; 0 Then y = 0If 0 <;= x <;1 Then y = 1If 1 <;= x <; 2 Then y = 2If x >;= 2 Then y = 3
内容
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如下命令中不能实现如下微分方程组[img=327x203]17e443a5d83ce02.png[/img]，在初值条件[img=172x112]17e443a5e2ead01.png[/img]下的特解求解的是： A: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1', 'y(0)=0', 't') B: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1, y(0)=0', 't') C: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1', 'y(0)=0') D: [x,y] = dsolve('Dx+5*x+y = exp(t)', 'Dy-x-3*y=0', 'x(0)=1', 'y(0)=0', 'x')
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9. $y=\log_x 2$的反函数为 A: $y=2^{1/x},x >0$ B: $y=2^{x},x >0$ C: $y=2^{1/x}, x \neq 0$ D: $y=2^{1/x},x >0, x \neq 1$
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如下程序的运行结果是（ ） intx=1,y=1;if(x==1) y=x+1;elseif(y==2) x=y+1;else y=0; A: x=1, y=2 B: x=3, y=2 C: x=3, y=0 D: x=1, y=0
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下列语句与y=(x>;0?1:x<;0?-1:0);语句功能相同是( ) A: if (x) if(x>;0) y=1; else if(x<;0) y=-1;else y=0; B: y=-1; if(x>;0) y=1; else y=-1; C: if (x>;0) y=1; else if(x<;0) y=-1; else y=0; D: y=0; if(x>;=0) y=1;else if(x==0) y=0; else y=-1;
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当x为大于1的奇数时，执行下面的语句后y的值为0的是______。 A: if (x%2 == 1) y = 1 ; else y = 0 ; B: if (x/2 ) y = 1 ; else y = 0 ; C: if (x%2 != 0) y = 1 ; else y = 0 ; D: if ( x%2 == 0 ) y = 1 ; else y = 0 ;