作业帮3x²y-[2x²y-(2xyz-x²z)-5z]-(2xyz+4x²z)其中x=12 y=-3 z=1
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3x²y-[2x²y-(2xyz-x²z)-5z]-(2xyz+4x²z)其中x=12 y=-3 z=1
3x²y-[2x²y-(2xyz-x²z)-5z]-(2xyz+4x²z)其中x=12 y=-3 z=1
3x²y-[2x²y-(2xyz-x²z)-5z]-(2xyz+4x²z)其中x=12 y=-3 z=1