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1.x23sin-x≠0(2)y=
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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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3.20.G:x 2 y 2 -2x- √ 2 \sqrt{2} y=0经过椭圆 x 2 a 2 \frac{{x}^{2}}{{a}^{2}} y 2 b 2 \frac{{y}^{2}}{{b}^
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4.(4)y" -( )y' y=0, y=Ce C,e
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5.若集合A={x|A、(-∞,0]∪( 2 2 , ∞)B、( 2 2 , ∞)C、(-∞,0]∪[ 2 2 , ∞)D、[ 2 2 , ∞)
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6.求解 x, y 使得 x^2 + y^2 = p.设 p = 20190221 求解 x, y 使得 x^2 + y^2 = p.
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7.2x 2 (3xy 2 ﹣x 2 y)﹣2(xy 2 x 2 )
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8.0 1 2 3 4
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9.If the production function is y = k1/2, the steady-state value of y is: ( )
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10.\(设f(x),g(x)是可微函数,且满足u(x,y)=f(2x+5y)+g(2x-5y),\\u(x,0)=\sin {2x},u'_y(x,0)=0,则u(x,y)=(\,)\)