(()=>{letx,y;try{thrownewError();}catch(x){(x=1),(y=2);console.log(x);}console.log(x);console.log(y);})();以上代码运行结果为（）
A: 1undefined2
B: undefinedundefinedundefined
C: 112
D: 1undefinedundefined
A: 1undefined2
B: undefinedundefinedundefined
C: 112
D: 1undefinedundefined
举一反三
- 下列代码输出的结果是 var y = 1; var x = y = typeof x; console.log(x); A: undefined B: 1 C: y D: 报错
- 实验命令“ syms x y; z=2*exp(x*y)+log(x+y)； zx=diff(z,'x')”的结果是【】. A: 2*exp(x*y)+log(x+y); B: 2* y*exp(x*y)+1/(x+y); C: 2*x*exp(x*y)+1/(x+y); D: 无结果.
- <img src="http://edu-image.nosdn.127.net/E6A0628104FCB0F521FBF2AAAC7F1968.png?imageView&thumbnail=890x0&quality=100" style="width: 558px; height: 33px;" />? syms xy=log(1/x*x+exp(x))+sin(1-x^2)dy/dx=diff(y,x)|syms xy=log(1/x/x+exp(x))+sin(1-x^2)dydx=diff(y,x)|syms xy=log(1/x/x+exp(x))+sin(1-x)^2dydx=diff(y,x)|syms xy=log(1/x/x+exp^x)+sin(1-x^2)dydx=diff(y,x)
- 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
- 下列代码的输出结果是（ ）。function maxC(x: number, y?: number): number { if (y) { return x y ? x : y; } else { return x; }}console.log(maxC(3)); A: 运行错误 B: 运行正确，结果为1 C: 运行正确，结果为2 D: 运行正确，结果为3