Z=(X^2一y)/(X十y),而y=2X一3,求dz/dx

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Z=(X^2一y)/(X十y),而y=2X一3,求dz/dxZ=(X^2一y)/(X十y),而y=2X一3,求dz/dxZ=(X^2一y)/(X十y),而y=2X一3,求dz/dx

Z=(X^2一y)/(X十y),而y=2X一3,求dz/dx
Z=(X^2一y)/(X十y),而y=2X一3,求dz/dx

Z=(X^2一y)/(X十y),而y=2X一3,求dz/dx