(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3
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(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3(5x²y-2xy²-3xy)-(2xy+5x&s
(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3
(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3
(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3
(5x²y-2xy²-3xy)-(2xy+5x²y-2xy²
=5x²y-2xy²-3xy-2xy-5x²y+2xy²
=-5xy
=-1/3
想找份事来做
原式=-5xy=-5*(-1/5)*(-1/3)=-1/3