皮皮学，免费搜题
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搜题
【简答题】
根据对话内容，从方框内所给的选项中选出最佳选项。 A: Hey, Stephen. B: Hi! How is it going recently? A: Terrible! I always feel upset. B: 1.________ A: My parents always ask me to study hard and encourage me before exams. But actually it makes me stressed out. 2.________ B: Don't worry. Why don't you log on to the micro blog (登录微博) to share your feelings with others? A: Really? 3.________ B: Yes, I think so. It's very popular among us young people. You can get many replies from friends in the same situation, which may make you feel better. A: 4.________ B: Let me see. Well, you'd better have a try first. If you have a chance, you should suggest your parents read your micro blog, they'll know you better. A: 5.________ Thank you very much. B: Not at all. A. I won't do it! B. Sounds great. C. What's wrong? D. Is it helpful to me? E. It's so embarrassing! F. I don't know how to deal with it. G. But what if my parents don't let me do it?
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皮皮学刷刷变学霸
举一反三
【单选题】【图片】
A.
f=3*x^2-sin(x)+sqrt(x); int(f,x)
B.
syms x; f=3*x^2-sin(x)+sqrt(x); int(f,x)
C.
syms y; f=3*x^2-sin(x)+sqrt(x); int(f,x)
D.
syms x; f=3*x^2-sin(x)+sqrt(x); lnt(y,x)
【单选题】【图片】
A.
f=1/sqrt(1-x^2); int(f, x, 0, 1/2)
B.
syms y; f=1/sqrt(1-x^2); int(f, x, 0, 1/2)
C.
syms x; f=1/sqrt(1-x^2); int(f, x, 1/2, 0)
D.
syms x; f=1/sqrt(1-x^2); int(f, x, 0, 1/2)
【单选题】【图片】
A.
f=5; int(f,x,-3,2)
B.
syms y; f=5; int(f, x, -3, 2)
C.
syms x; f=5; int(f, x, 2, -3)
D.
syms x; f=5; int(f, x, -3, 2)
【单选题】设二维随机变量(X, Y)的联合密度为 下列哪一项指令用于计算变量x的期望?
A.
syms x y int(int((x+y)/8,y,0,2),x,0,2)
B.
syms x y int(int(x*(x+y)/8,y,0,2),x,0,2)
C.
syms x y int(int(y*(x+y)/8,y,0,2),x,0,2)
D.
syms x y int(int(x*y*(x+y)/8,y,0,2),x,0,2)
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