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答案:
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1.()x'- yin y=0
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2.13、设y=y(x)满足y" 2y y=0,且y(0)=0,y(0)=1,则y(x)dx
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3.对于 int x, y;语句 if (x < 0) y = -1; else if (x==0) y = 0; else y = 1;等价于
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4.( ) = ò ò y y dx y x
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5.\(设f(x),g(x)是可微函数,且满足u(x,y)=f(2x+5y)+g(2x-5y),\\u(x,0)=\sin {2x},u'_y(x,0)=0,则u(x,y)=(\,)\)
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6.0≤x≤2023、y={2x-1020≤X≤30x 4030≤x≤60
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7.曲线y=xln(e+1/x)(x>0)的渐近线为
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8.下列哪一项等同于x!=y?: ! (x == y)|x > y && x < y|x > y || x < y|x >= y || x <= y
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9.The random variables X and Y have a discrete joint distribution with joint probability function:P(X =
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10.int x=0,y=0,z=0;if (x=y+z) printf("***");else printf("###");