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答案:
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1.()x'- yin y=0
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2.1xy- yin y= 0
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3.()xy'- yin y=0
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4.(3) xin r yin y> ( y)In (r> 0,y>0,r
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5.函数y=A、y=x 2 (x≥0)B、y=-x 2 (x≥0)C、y=x 2 (x≤0)D、y=-x 2 (x≤0)
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6.x=(-y)z,z=-x,-y<0,z>0,y=?
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7.(1)(x yx x>0,y>0,x≠y,a>1;
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8.2z=x2 y2,x y=a(x=0,y=0,z=0
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9.13、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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10.xyz<>0, 问x(y z)>0?(1)|x y|=|x| |y(2)|y z|=|y| |z