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答案:
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1.)ry m- y= 0
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2.B.-2yf(r,y)CyDf(ry)
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3.(3) f(x, y,z)= ry y = l,x y z= 0.
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4.B. df(x. y)d.C. dy. f(ry)dxD. dyf(r, y)d.
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5.(5) 2y" y=0,H0)=(0)=y(0)=0,'(0
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6.13、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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7.m=5while(m==0): m-=1print(m)
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8.RY
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9.2(l y)/l2, 0 y lfY(y) 。0, 其 他
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10.2z=x2 y2,x y=a(x=0,y=0,z=0